diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 7cf4bd1d8..b81648db1 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -4204,8 +4204,9 @@ paths:
 
         With `groupBy=day` on a cumulative type the rows are one sum per local day, and `limit` / `offset` page over
         those days; every returned day is complete. `type=SLEEP_DURATION` returns one row per night, paged the same way
-        over nights. On both, `meta.total` counts the days or nights in the filtered window, and a page holds at most
-        1000 of them (`meta.limit` echoes the value applied).
+        over nights. On both, `meta.total` counts the days or nights in the filtered window. A day-sum page takes
+        `limit` as asked (up to the list's 5000); a sleep page holds at most 1000 nights, and `meta.limit` echoes the
+        value applied.
       parameters:
         - in: query
           name: type
diff --git a/messages/de.json b/messages/de.json
index 9d55f7033..80dbdbd1a 100644
--- a/messages/de.json
+++ b/messages/de.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} Std.",
     "errorIdLabel": "Fehler-ID",
     "errorIdCopy": "Fehler-ID kopieren",
-    "errorIdCopied": "Fehler-ID kopiert"
+    "errorIdCopied": "Fehler-ID kopiert",
+    "readThrottled": "Gerade zu viele Anfragen. Versuch es später noch einmal."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/en.json b/messages/en.json
index c7bb1372c..23a6f6c43 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} h",
     "errorIdLabel": "Error ID",
     "errorIdCopy": "Copy error ID",
-    "errorIdCopied": "Error ID copied"
+    "errorIdCopied": "Error ID copied",
+    "readThrottled": "Too many requests just now. Try again later."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/es.json b/messages/es.json
index 776b0ad5b..14faca41b 100644
--- a/messages/es.json
+++ b/messages/es.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} h",
     "errorIdLabel": "ID de error",
     "errorIdCopy": "Copiar ID de error",
-    "errorIdCopied": "ID de error copiado"
+    "errorIdCopied": "ID de error copiado",
+    "readThrottled": "Demasiadas solicitudes ahora mismo. Vuelve a intentarlo más tarde."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/fr.json b/messages/fr.json
index 3bc572f44..98bf35b22 100644
--- a/messages/fr.json
+++ b/messages/fr.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} h",
     "errorIdLabel": "ID d'erreur",
     "errorIdCopy": "Copier l'ID d'erreur",
-    "errorIdCopied": "ID d'erreur copié"
+    "errorIdCopied": "ID d'erreur copié",
+    "readThrottled": "Trop de requêtes pour le moment. Réessaie plus tard."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/it.json b/messages/it.json
index e6715b220..33213d015 100644
--- a/messages/it.json
+++ b/messages/it.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} h",
     "errorIdLabel": "ID errore",
     "errorIdCopy": "Copia ID errore",
-    "errorIdCopied": "ID errore copiato"
+    "errorIdCopied": "ID errore copiato",
+    "readThrottled": "Troppe richieste in questo momento. Riprova più tardi."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/ko.json b/messages/ko.json
index cd91ec50d..265a64224 100644
--- a/messages/ko.json
+++ b/messages/ko.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time}시간",
     "errorIdLabel": "오류 ID",
     "errorIdCopy": "오류 ID 복사",
-    "errorIdCopied": "오류 ID 복사됨"
+    "errorIdCopied": "오류 ID 복사됨",
+    "readThrottled": "지금은 요청이 너무 많아요. 나중에 다시 시도해 주세요."
   },
   "apiErrors": {
     "measurement": {
diff --git a/messages/pl.json b/messages/pl.json
index 7c2769cb9..c5cb87b1b 100644
--- a/messages/pl.json
+++ b/messages/pl.json
@@ -54,7 +54,8 @@
     "durationClockHours": "{time} godz.",
     "errorIdLabel": "ID błędu",
     "errorIdCopy": "Kopiuj ID błędu",
-    "errorIdCopied": "Skopiowano ID błędu"
+    "errorIdCopied": "Skopiowano ID błędu",
+    "readThrottled": "Zbyt wiele zapytań w tej chwili. Spróbuj ponownie później."
   },
   "apiErrors": {
     "measurement": {
diff --git a/src/app/api/measurements/route.ts b/src/app/api/measurements/route.ts
index 6939d4777..1efeef64c 100644
--- a/src/app/api/measurements/route.ts
+++ b/src/app/api/measurements/route.ts
@@ -55,7 +55,7 @@ import {
   pickMainNightAndNaps,
   SESSION_GAP_MS,
 } from "@/lib/analytics/sleep-night";
-import { resolveUserTimezone } from "@/lib/tz/resolver";
+import { resolveStoredTimezone, resolveUserTimezone } from "@/lib/tz/resolver";
 import {
   isNamedSleepStageBody,
   sleepStageEntrySchema,
@@ -79,7 +79,6 @@ import {
   type GlucoseContext,
   type SleepStage,
 } from "@/generated/prisma/client";
-import { DEFAULT_TIMEZONE, isValidTimezone } from "@/lib/tz/format";
 
 export const GET = apiHandler(async (request: NextRequest) => {
   const { user } = await requireRecordAuth("read", "measurements");
@@ -193,10 +192,9 @@ export const GET = apiHandler(async (request: NextRequest) => {
   // hid. Gated to cumulative HK types — the spot-sample types render
   // one-row-per-event already and have nothing to drill into.
   if (dayKey && type && CUMULATIVE_HK_TYPES.has(type as MeasurementType)) {
-    const tz =
-      user.timezone && user.timezone.length > 0
-        ? user.timezone
-        : DEFAULT_TIMEZONE;
+    // The same zone the day-grouped list cuts its days in, so a row's
+    // drill-down opens exactly the day the row summed.
+    const tz = await resolveStoredTimezone(user.timezone);
     // Resolve `[dayStart, dayEnd)` for the requested calendar day in
     // the user's local zone. v1.4.37 W10 — `localDayWindow` honours
     // DST: the previous shape (`canonicalDailyTimestamp ± 12 h`)
@@ -408,13 +406,10 @@ async function dayGroupedListResponse(
   },
 ) {
   const { type, limit, offset, sortDir } = opts;
-  const stored =
-    user.timezone && user.timezone.length > 0
-      ? user.timezone
-      : DEFAULT_TIMEZONE;
-  // A zone Postgres does not know would 500 the read; the drill-down cuts
-  // days in the same zone, so both must agree on it.
-  const tz = isValidTimezone(stored) ? stored : DEFAULT_TIMEZONE;
+  // One resolver for the stored zone, shared with the drill-down and the
+  // sleep list: a usable IANA name or the instance default, never a value
+  // Postgres would refuse. The drill-down must cut the same days.
+  const tz = await resolveStoredTimezone(user.timezone);
 
   // The request's filters, as SQL: the same ones the plain list applies.
   const filters = Prisma.sql`
@@ -623,7 +618,7 @@ const SLEEP_NIGHT_PAGE_MAX = 1000;
  * there without saying so to the client.
  */
 async function sleepListResponse(
-  user: { id: string },
+  user: { id: string; timezone?: string | null },
   opts: {
     from?: Date;
     to?: Date;
@@ -636,7 +631,7 @@ async function sleepListResponse(
   const { from, to, offset, sortDir, dayKey } = opts;
   const limit = Math.min(opts.limit, SLEEP_NIGHT_PAGE_MAX);
   const [tz, priorityJson] = await Promise.all([
-    resolveUserTimezone(user.id),
+    resolveStoredTimezone(user.timezone),
     loadUserSourcePriority(user.id),
   ]);
 
@@ -647,7 +642,6 @@ async function sleepListResponse(
     ...(dayKey ? { night: dayKey, limit: 1, offset: 0 } : { limit, offset }),
   });
   const nightKeys = page.nights.map((n) => n.night);
-  const wanted = new Set(nightKeys);
 
   // The page's sessions lie between the first one's start and the last one's
   // end, and every other session is more than the session gap away from that
@@ -692,8 +686,23 @@ async function sleepListResponse(
       },
     });
   }
-  const sessions = reconstructSleepSessions(rows, tz, priorityJson).filter(
-    (s) => wanted.has(s.night),
+  // Each reconstructed session is filed under the page night whose span
+  // holds it, and takes that night's label. Matching by the reconstruction's
+  // own label lost a night whenever the two named different days: the page
+  // counted it under one, the reconstruction filed it under the other, and
+  // the filter dropped it from both.
+  const sessions = reconstructSleepSessions(rows, tz, priorityJson).flatMap(
+    (session) => {
+      // A second of slack absorbs the sub-millisecond rounding between the
+      // two start computations; sessions sit hours apart, so it can never
+      // reach a neighbour.
+      const home = page.nights.find(
+        (n) =>
+          n.spanStart.getTime() - 1000 <= session.start.getTime() &&
+          session.end.getTime() <= n.spanEnd.getTime() + 1000,
+      );
+      return home ? [{ ...session, night: home.night }] : [];
+    },
   );
 
   // Drill-down — return the requested night's canonical stage segments.
@@ -812,11 +821,24 @@ async function sleepListResponse(
  * filtered set from the same query. `spanStart` / `spanEnd` bound the
  * night's counting sessions, so the caller reads exactly their rows.
  *
- * The session's night here is taken over every writer, while the JS fold
- * takes it over the winning writer only. They part only when a losing writer
- * runs past midnight and the winner does not; that night then sits on the
- * page and comes back without a row, and `total` counts it.
+ * This label is the list's own: the page is cut by it, a row carries it and
+ * a drill-down asks by it. It is taken over every writer, where the JS
+ * reconstruction takes the winning writer only, so the two can name
+ * different days (a losing phone's in-bed span running past midnight while
+ * the watch stops before it). The caller therefore never matches the two by
+ * label: it files each reconstructed session under the night whose span
+ * holds it, which is exact, because a reconstructed session is one of these
+ * sessions narrowed to its winner.
+ *
+ * With `night` set (a drill-down) the scan is cut to a window of 36 hours
+ * either side of that local day. Sessions are split at a three-hour gap, so
+ * a session ending on that day starts inside the window unless it lasted
+ * over a day and a half, and every session the cut truncates ends on another
+ * day.
  */
+/** How far a drill-down's session scan reaches either side of its day. */
+const DRILL_DOWN_REACH_MS = 36 * 60 * 60 * 1000;
+
 async function sleepNightPage(
   userId: string,
   tz: string,
@@ -832,8 +854,8 @@ async function sleepNightPage(
   nights: Array<{ night: string; spanStart: Date; spanEnd: Date }>;
   total: number;
 }> {
-  const zone = isValidTimezone(tz) ? tz : DEFAULT_TIMEZONE;
   const gapSeconds = SESSION_GAP_MS / 1000;
+  const window = opts.night ? localDayWindow(opts.night, tz) : null;
   // Direction comes from the Zod enum, never from raw input.
   const direction = Prisma.raw(opts.sortDir === "asc" ? "ASC" : "DESC");
   const nightsCte = Prisma.sql`
@@ -849,6 +871,12 @@ async function sleepNightPage(
         AND m."deleted_at" IS NULL
         ${opts.from ? Prisma.sql`AND m."measured_at" >= ${opts.from}` : Prisma.empty}
         ${opts.to ? Prisma.sql`AND m."measured_at" <= ${opts.to}` : Prisma.empty}
+        ${
+          window
+            ? Prisma.sql`AND m."measured_at" >= ${new Date(window.dayStart.getTime() - DRILL_DOWN_REACH_MS)}
+              AND m."measured_at" < ${new Date(window.dayEnd.getTime() + DRILL_DOWN_REACH_MS)}`
+            : Prisma.empty
+        }
     ), o AS (
       SELECT r.*, MAX(e) OVER (
         ORDER BY s, e ROWS BETWEEN UNBOUNDED PRECEDING AND 1 PRECEDING
@@ -867,7 +895,7 @@ async function sleepNightPage(
       HAVING BOOL_OR(asleep)
     ), nights AS (
       SELECT
-        to_char((e AT TIME ZONE 'UTC') AT TIME ZONE ${zone}, 'YYYY-MM-DD') AS night,
+        to_char((e AT TIME ZONE 'UTC') AT TIME ZONE ${tz}, 'YYYY-MM-DD') AS night,
         MIN(s) AS span_start,
         MAX(e) AS span_end
       FROM sess
diff --git a/src/components/cycle/__tests__/use-cycle-ring-has-dial.test.tsx b/src/components/cycle/__tests__/use-cycle-ring-has-dial.test.tsx
index 6d7653583..4b872315e 100644
--- a/src/components/cycle/__tests__/use-cycle-ring-has-dial.test.tsx
+++ b/src/components/cycle/__tests__/use-cycle-ring-has-dial.test.tsx
@@ -13,6 +13,7 @@ import { renderToStaticMarkup } from "react-dom/server";
 import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
 import { describe, expect, it } from "vitest";
 
+import { ApiError } from "@/lib/api/api-fetch";
 import { queryKeys } from "@/lib/query-keys";
 
 import { localYmd, useCycleRingDial } from "../use-cycle";
@@ -32,9 +33,11 @@ function Probe({ enabled }: { enabled: boolean }) {
 
 /** Marks the calendar read as failed, with no data behind it. */
 const FAILED = Symbol("failed");
+/** Marks the calendar read as refused (a share without the section). */
+const REFUSED = Symbol("refused");
 
 function probe(
-  verdict: unknown | undefined | typeof FAILED,
+  verdict: unknown | undefined | typeof FAILED | typeof REFUSED,
   enabled = true,
 ): string {
   const client = new QueryClient({
@@ -45,13 +48,16 @@ function probe(
     },
   });
   const [from, to] = window();
-  if (verdict === FAILED) {
+  if (verdict === FAILED || verdict === REFUSED) {
     client
       .getQueryCache()
       .build(client, { queryKey: queryKeys.cycleCalendar(from, to) })
       .setState({
         status: "error",
-        error: new Error("calendar read failed"),
+        error:
+          verdict === REFUSED
+            ? new ApiError("Forbidden", 403)
+            : new Error("calendar read failed"),
         fetchStatus: "idle",
       });
   } else if (verdict !== undefined) {
@@ -92,6 +98,11 @@ describe("useCycleRingDial", () => {
     expect(probe(FAILED)).toBe("false:false:failed");
     expect(probe(FAILED, false)).toBe("false:false");
   });
+
+  // A refused read draws nothing in the tile, so it must not hold a cell.
+  it("holds no cell for a refused read", () => {
+    expect(probe(REFUSED)).toBe("false:false");
+  });
 });
 
 describe("the scores strip keeps the ring's cell on a failed read", () => {
diff --git a/src/components/cycle/cycle-ring-tile.tsx b/src/components/cycle/cycle-ring-tile.tsx
index 0096a0184..4483a177f 100644
--- a/src/components/cycle/cycle-ring-tile.tsx
+++ b/src/components/cycle/cycle-ring-tile.tsx
@@ -4,7 +4,7 @@ import { useState } from "react";
 import Link from "next/link";
 import { Droplets } from "lucide-react";
 
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { cn } from "@/lib/utils";
 import { useTranslations } from "@/lib/i18n/context";
 import { CycleRing } from "./cycle-ring";
@@ -71,7 +71,8 @@ export function CycleRingTile({ className }: { className?: string }) {
   if (calendar.isLoading && !calendar.data) return null;
   if (calendar.isError && !calendar.data) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={calendar.error}
         slot="wellness-cycle-tile-error"
         message={t("cycle.wellnessRing.loadError")}
         onRetry={() => void calendar.refetch()}
diff --git a/src/components/cycle/use-cycle.ts b/src/components/cycle/use-cycle.ts
index 285c5d7b6..d1857122e 100644
--- a/src/components/cycle/use-cycle.ts
+++ b/src/components/cycle/use-cycle.ts
@@ -24,6 +24,7 @@ import { useTranslations } from "@/lib/i18n/context";
 import { randomId } from "@/lib/random-id";
 import { toastWrittenOutcome } from "@/components/outcome/outcome-toast";
 import { useCalendarDate } from "@/hooks/use-calendar-date";
+import { readFailureKind } from "@/components/ui/read-failure-row";
 
 import {
   cycleDependentKeys,
@@ -151,7 +152,13 @@ export function useCycleRingDial(enabled: boolean): {
   return {
     dial: enabled && verdict?.phase != null && verdict.dayOfCycle != null,
     pending: enabled && calendar.isPending,
-    failed: enabled && calendar.isError && !calendar.data,
+    // A refused read is not a failure to report: the tile would draw nothing
+    // and leave its cell empty.
+    failed:
+      enabled &&
+      calendar.isError &&
+      !calendar.data &&
+      readFailureKind(calendar.error) !== "denied",
   };
 }
 
diff --git a/src/components/day/since-last-visit.tsx b/src/components/day/since-last-visit.tsx
index 34982d4d1..54887ad6b 100644
--- a/src/components/day/since-last-visit.tsx
+++ b/src/components/day/since-last-visit.tsx
@@ -18,7 +18,7 @@ import {
 
 import { Button } from "@/components/ui/button";
 import { Card, CardContent } from "@/components/ui/card";
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import type { EncounterDTO } from "@/lib/encounters/dto";
 import { apiGet } from "@/lib/api/api-fetch";
 import type {
@@ -61,7 +61,9 @@ import { useTodayKey } from "./use-today-key";
  * most often turns out empty, then collapse it again. Arriving late costs
  * only the visit list below a shift, once per window; the read is cached for
  * five minutes. A failed read is not a quiet window, so it says so in a
- * compact row with a retry.
+ * compact row with a retry. A refused one draws nothing: visits need the
+ * profile section and this window reads measurements, and a share can carry
+ * the first without the second.
  */
 
 const EVENT_ICON: Partial<Record<DayEventKind, LucideIcon>> = {
@@ -193,7 +195,8 @@ export function SinceLastVisit({
 
   if (window.isError && rows.length === 0) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={window.error}
         slot="since-last-visit-error"
         message={t("day.sinceLastVisit.loadError")}
         onRetry={() => void window.refetch()}
diff --git a/src/components/encounters/__tests__/visits-section.test.tsx b/src/components/encounters/__tests__/visits-section.test.tsx
index c945dbe1d..c4b21a037 100644
--- a/src/components/encounters/__tests__/visits-section.test.tsx
+++ b/src/components/encounters/__tests__/visits-section.test.tsx
@@ -48,6 +48,7 @@ vi.mock("@/lib/api/api-fetch", async () => {
 });
 
 import { dateKeyOfInstant, todayKeyInZone } from "@/components/day/day-url";
+import { ApiError } from "@/lib/api/api-fetch";
 import type { DayNotableWindowResponse } from "@/lib/day/contract";
 import { I18nProvider } from "@/lib/i18n/context";
 import { queryKeys } from "@/lib/query-keys";
@@ -234,8 +235,8 @@ describe("<VisitsSection> since the last visit", () => {
     expect(upcomingCards(html)).toBe(upcomingCards(baseline));
   });
 
-  it("says a failed read failed, rather than passing it off as a quiet window", () => {
-    const html = render({ upcoming: [next], past: [last] }, (queryClient) => {
+  function seedFailure(error: Error) {
+    return (queryClient: QueryClient) => {
       const tz = DEFAULT_TIMEZONE;
       const queryKey = queryKeys.dayNotable(
         dateKeyOfInstant(last.occurredAt, tz),
@@ -247,12 +248,15 @@ describe("<VisitsSection> since the last visit", () => {
       queryClient
         .getQueryCache()
         .build(queryClient, { queryKey })
-        .setState({
-          status: "error",
-          error: new Error("window read failed"),
-          fetchStatus: "idle",
-        });
-    });
+        .setState({ status: "error", error, fetchStatus: "idle" });
+    };
+  }
+
+  it("says a failed read failed, rather than passing it off as a quiet window", () => {
+    const html = render(
+      { upcoming: [next], past: [last] },
+      seedFailure(new ApiError("window read failed", 500)),
+    );
     const baseline = render({ upcoming: [next], past: [] });
     expect(html).toContain('data-slot="since-last-visit-error"');
     expect(html).toContain('role="alert"');
@@ -260,6 +264,17 @@ describe("<VisitsSection> since the last visit", () => {
     expect(upcomingCards(html)).toBe(upcomingCards(baseline));
   });
 
+  // Visits need the profile section, the window reads measurements, and a
+  // share can carry the first without the second. A refusal is not a failure.
+  it("draws nothing when the window read is refused", () => {
+    const html = render(
+      { upcoming: [next], past: [last] },
+      seedFailure(new ApiError("Forbidden", 403)),
+    );
+    expect(html).not.toContain("since-last-visit-error");
+    expect(html).not.toContain('role="alert"');
+  });
+
   it("draws one card with the rows once there is something to list", () => {
     const html = render(
       { upcoming: [next], past: [last] },
diff --git a/src/components/insights/derived/coach-read-strip.tsx b/src/components/insights/derived/coach-read-strip.tsx
index 6bb30c8d3..0519c58a8 100644
--- a/src/components/insights/derived/coach-read-strip.tsx
+++ b/src/components/insights/derived/coach-read-strip.tsx
@@ -11,7 +11,7 @@ import { queryKeys } from "@/lib/query-keys";
 import { metricFractionDigits } from "@/lib/measurements/value-domain";
 import { apiGet } from "@/lib/api/api-fetch";
 import { Card, CardContent, CardHeader } from "@/components/ui/card";
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { Skeleton } from "@/components/ui/skeleton";
 import { TileHeader } from "@/components/insights/tile-header";
 import type { CoachReadStripData } from "@/lib/insights/derived/coach-read-shape";
@@ -80,7 +80,7 @@ export function CoachReadStrip({
   const transformed = unitDisplay.isTransformed(metricType);
   const resolvedUnit = transformed ? unitDisplay.unitFor(metricType) : unit;
 
-  const { data, isError, refetch } = useQuery({
+  const { data, error, isError, refetch } = useQuery({
     queryKey: queryKeys.insightsCoachRead(metricType, locale),
     queryFn: () =>
       apiGet<CoachReadStripData>(
@@ -97,12 +97,15 @@ export function CoachReadStrip({
   // baseline line degrades to the "learning" copy), so the placeholder only
   // ever gives way to a card of its own height. A failed read gives way to a
   // notice with a retry: dropping the strip read as "nothing to say about
-  // today", which is not what happened.
+  // today", which is not what happened. The route is a manage-level read, so
+  // a viewer on a read-only share is refused it; that draws nothing, and a
+  // spent analytics budget says so without offering a retry.
   if (!mounted || !data) {
     if (!isAuthenticated) return null;
     if (isError) {
       return (
-        <QueryErrorRow
+        <ReadFailureRow
+          error={error}
           slot="coach-read-strip-error"
           message={t("insights.coach.readStrip.loadError")}
           onRetry={() => void refetch()}
diff --git a/src/components/insights/mood/mood-prognosis-card.tsx b/src/components/insights/mood/mood-prognosis-card.tsx
index 3220acf6c..e6acef61f 100644
--- a/src/components/insights/mood/mood-prognosis-card.tsx
+++ b/src/components/insights/mood/mood-prognosis-card.tsx
@@ -32,7 +32,7 @@ import { Compass } from "lucide-react";
 
 import { Card, CardContent, CardHeader } from "@/components/ui/card";
 import { TileHeader } from "@/components/insights/tile-header";
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { useAuth } from "@/hooks/use-auth";
 import { apiGet } from "@/lib/api/api-fetch";
 import { formatDate } from "@/lib/date-format";
@@ -62,7 +62,7 @@ export function MoodPrognosisCard() {
   const { isAuthenticated } = useAuth();
   const { t } = useTranslations();
 
-  const { data, isError, refetch } = useQuery({
+  const { data, error, isError, refetch } = useQuery({
     queryKey: queryKeys.moodPrognosis(),
     queryFn: async () => apiGet<PrognosisReading>("/api/mood/prognosis"),
     enabled: isAuthenticated,
@@ -71,7 +71,8 @@ export function MoodPrognosisCard() {
 
   if (isError && !data) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={error}
         slot="mood-prognosis-error"
         message={t("insights.mood.prognosis.loadError")}
         onRetry={() => void refetch()}
diff --git a/src/components/insights/nutrients/caffeine-card.tsx b/src/components/insights/nutrients/caffeine-card.tsx
index 399053bbe..7d74d06bc 100644
--- a/src/components/insights/nutrients/caffeine-card.tsx
+++ b/src/components/insights/nutrients/caffeine-card.tsx
@@ -4,7 +4,7 @@ import { useQuery } from "@tanstack/react-query";
 import { Coffee } from "lucide-react";
 
 import { Card, CardContent, CardHeader } from "@/components/ui/card";
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { TileHeader } from "@/components/insights/tile-header";
 import { NutrientDailyBarChartDynamic } from "@/components/charts/nutrient-daily-bar-chart-dynamic";
 import { useTranslations, useFormatters } from "@/lib/i18n/context";
@@ -30,7 +30,7 @@ export function CaffeineCard() {
   const { t } = useTranslations();
   const fmt = useFormatters();
 
-  const { data, isError, refetch } = useQuery({
+  const { data, error, isError, refetch } = useQuery({
     queryKey: queryKeys.nutrientDaily("caffeine", WINDOW_DAYS),
     queryFn: () =>
       apiGet<NutrientDailySeries>(
@@ -43,7 +43,8 @@ export function CaffeineCard() {
 
   if (isError && !data) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={error}
         slot="nutrients-caffeine-error"
         message={t("nutrients.caffeine.loadError")}
         onRetry={() => void refetch()}
diff --git a/src/components/measurements/measurement-list.tsx b/src/components/measurements/measurement-list.tsx
index 625be97a8..36fe4fe3d 100644
--- a/src/components/measurements/measurement-list.tsx
+++ b/src/components/measurements/measurement-list.tsx
@@ -10,7 +10,7 @@ import { Button } from "@/components/ui/button";
 import { Badge } from "@/components/ui/badge";
 import { EmptyState } from "@/components/ui/empty-state";
 import { QueryErrorCard } from "@/components/ui/query-error-card";
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { Skeleton } from "@/components/ui/skeleton";
 import { ListRow } from "@/components/ui/list-row";
 import {
@@ -1924,7 +1924,8 @@ function DayDrillDown({
   }
   if (error) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={error}
         slot="measurement-drilldown-error"
         message={t("measurements.loadError")}
         onRetry={() => void refetch()}
diff --git a/src/components/mood/mood-quick-tags.tsx b/src/components/mood/mood-quick-tags.tsx
index ccb21e07f..c9fae8e23 100644
--- a/src/components/mood/mood-quick-tags.tsx
+++ b/src/components/mood/mood-quick-tags.tsx
@@ -3,7 +3,7 @@
 import { useQuery } from "@tanstack/react-query";
 import { Plus } from "lucide-react";
 
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { Skeleton } from "@/components/ui/skeleton";
 import { useAuth } from "@/hooks/use-auth";
 import { queryKeys } from "@/lib/query-keys";
@@ -63,7 +63,7 @@ export function MoodQuickTags({
   const { isAuthenticated } = useAuth();
   const { t } = useTranslations();
 
-  const { data, isLoading, isError, refetch } = useQuery({
+  const { data, error, isLoading, isError, refetch } = useQuery({
     queryKey: queryKeys.moodTagCatalog(),
     queryFn: async () => apiGet<CatalogResponse>("/api/mood/tags"),
     enabled: isAuthenticated,
@@ -75,7 +75,8 @@ export function MoodQuickTags({
   }
   if (isError && !data) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={error}
         slot="mood-quick-tags-error"
         message={t("mood.tagCatalogLoadError")}
         onRetry={() => void refetch()}
diff --git a/src/components/mood/mood-tag-picker.tsx b/src/components/mood/mood-tag-picker.tsx
index 900a64fbc..c15632b9b 100644
--- a/src/components/mood/mood-tag-picker.tsx
+++ b/src/components/mood/mood-tag-picker.tsx
@@ -4,7 +4,7 @@ import { useState } from "react";
 import { useQuery } from "@tanstack/react-query";
 import { Plus, Tag } from "lucide-react";
 
-import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ReadFailureRow } from "@/components/ui/read-failure-row";
 import { Skeleton } from "@/components/ui/skeleton";
 import { useAuth } from "@/hooks/use-auth";
 import { queryKeys } from "@/lib/query-keys";
@@ -105,7 +105,7 @@ export function MoodTagPicker({
   // tile belongs to, or null when closed.
   const [createGroupKey, setCreateGroupKey] = useState<string | null>(null);
 
-  const { data, isLoading, isError, refetch } = useQuery({
+  const { data, error, isLoading, isError, refetch } = useQuery({
     queryKey: queryKeys.moodTagCatalog(),
     queryFn: async () => {
       return apiGet<CatalogResponse>("/api/mood/tags");
@@ -124,7 +124,8 @@ export function MoodTagPicker({
 
   if (isError && !data) {
     return (
-      <QueryErrorRow
+      <ReadFailureRow
+        error={error}
         slot="mood-tag-picker-error"
         message={t("mood.tagCatalogLoadError")}
         onRetry={() => void refetch()}
diff --git a/src/components/ui/__tests__/read-failure-row.test.tsx b/src/components/ui/__tests__/read-failure-row.test.tsx
new file mode 100644
index 000000000..f24470030
--- /dev/null
+++ b/src/components/ui/__tests__/read-failure-row.test.tsx
@@ -0,0 +1,62 @@
+/**
+ * A supplementary read that fails is reported by what the failure means.
+ *
+ * Several strips and tiles answer a failed read with a retry row. Two
+ * failures are not worth one: a refusal (a read-only share reaching a
+ * manage-level read, a grant without the section) cannot be retried into
+ * success and must draw nothing, and a spent read budget would only be
+ * refused again by an immediate retry.
+ */
+import { describe, expect, it } from "vitest";
+import { renderToStaticMarkup } from "react-dom/server";
+
+import { ApiError } from "@/lib/api/api-fetch";
+import { I18nProvider } from "@/lib/i18n/context";
+import { ReadFailureRow, readFailureKind } from "../read-failure-row";
+
+function ssr(error: unknown) {
+  return renderToStaticMarkup(
+    <I18nProvider initialLocale="en">
+      <ReadFailureRow
+        error={error}
+        message="Could not load the strip."
+        onRetry={() => {}}
+        slot="probe"
+      />
+    </I18nProvider>,
+  );
+}
+
+describe("readFailureKind", () => {
+  it("names refusals, a spent budget and everything else", () => {
+    expect(readFailureKind(new ApiError("x", 401))).toBe("denied");
+    expect(readFailureKind(new ApiError("x", 403))).toBe("denied");
+    expect(readFailureKind(new ApiError("x", 429))).toBe("throttled");
+    expect(readFailureKind(new ApiError("x", 500))).toBe("failed");
+    expect(readFailureKind(new ApiError("x", 404))).toBe("failed");
+    expect(readFailureKind(new TypeError("Failed to fetch"))).toBe("failed");
+  });
+});
+
+describe("<ReadFailureRow>", () => {
+  it("draws nothing for a refused read", () => {
+    expect(ssr(new ApiError("Forbidden", 403))).toBe("");
+    expect(ssr(new ApiError("Unauthorized", 401))).toBe("");
+  });
+
+  it("says a spent budget without offering a retry", () => {
+    const html = ssr(new ApiError("Too many", 429));
+    expect(html).toContain('data-slot="probe"');
+    expect(html).toContain("Too many requests just now.");
+    expect(html).not.toContain("query-error-row-retry");
+  });
+
+  it("offers a retry for a real failure", () => {
+    const html = ssr(new ApiError("Boom", 500));
+    expect(html).toContain("Could not load the strip.");
+    expect(html).toContain('data-slot="query-error-row-retry"');
+    expect(ssr(new TypeError("Failed to fetch"))).toContain(
+      'data-slot="query-error-row-retry"',
+    );
+  });
+});
diff --git a/src/components/ui/read-failure-row.tsx b/src/components/ui/read-failure-row.tsx
new file mode 100644
index 000000000..7d6ab945d
--- /dev/null
+++ b/src/components/ui/read-failure-row.tsx
@@ -0,0 +1,68 @@
+"use client";
+
+import { QueryErrorRow } from "@/components/ui/query-error-row";
+import { ApiError } from "@/lib/api/api-fetch";
+import { useTranslations } from "@/lib/i18n/context";
+
+/**
+ * What a failed read means for the surface that made it.
+ *
+ *  - `denied`: 401 / 403. The viewer may not read this, typically a shared
+ *    or delegated record whose grant leaves the section out. Nothing failed
+ *    that a retry could fix, and the surface is simply not theirs to see.
+ *  - `throttled`: 429. The read budget is spent for now; an immediate retry
+ *    would only be refused again.
+ *  - `failed`: everything else, a real read failure worth a retry.
+ */
+export type ReadFailureKind = "denied" | "throttled" | "failed";
+
+export function readFailureKind(error: unknown): ReadFailureKind {
+  if (error instanceof ApiError) {
+    if (error.status === 401 || error.status === 403) return "denied";
+    if (error.status === 429) return "throttled";
+  }
+  return "failed";
+}
+
+/**
+ * The compact failure row for a supplementary read, by what the failure
+ * means: nothing for a refusal, a notice without a retry for a spent budget,
+ * and `QueryErrorRow` with a retry for a real failure.
+ *
+ * For a surface the page can stand without (a strip, a tile, a block under a
+ * card). A primary list keeps `QueryErrorCard`.
+ */
+export function ReadFailureRow({
+  error,
+  message,
+  onRetry,
+  slot,
+  className,
+}: {
+  error: unknown;
+  message?: string;
+  onRetry: () => void;
+  slot?: string;
+  className?: string;
+}) {
+  const { t } = useTranslations();
+  const kind = readFailureKind(error);
+  if (kind === "denied") return null;
+  if (kind === "throttled") {
+    return (
+      <QueryErrorRow
+        slot={slot}
+        message={t("common.readThrottled")}
+        className={className}
+      />
+    );
+  }
+  return (
+    <QueryErrorRow
+      slot={slot}
+      message={message}
+      onRetry={onRetry}
+      className={className}
+    />
+  );
+}
diff --git a/src/lib/openapi/routes/measurements.ts b/src/lib/openapi/routes/measurements.ts
index b435f3850..35e46830c 100644
--- a/src/lib/openapi/routes/measurements.ts
+++ b/src/lib/openapi/routes/measurements.ts
@@ -804,7 +804,7 @@ export const measurementPaths: NonNullable<ZodOpenApiObject["paths"]> = {
       summary: "List measurements",
       description:
         "Filter by type + date range. Response is paged via offset/limit; default limit 100.\n\n" +
-        "With `groupBy=day` on a cumulative type the rows are one sum per local day, and `limit` / `offset` page over those days; every returned day is complete. `type=SLEEP_DURATION` returns one row per night, paged the same way over nights. On both, `meta.total` counts the days or nights in the filtered window, and a page holds at most 1000 of them (`meta.limit` echoes the value applied).",
+        "With `groupBy=day` on a cumulative type the rows are one sum per local day, and `limit` / `offset` page over those days; every returned day is complete. `type=SLEEP_DURATION` returns one row per night, paged the same way over nights. On both, `meta.total` counts the days or nights in the filtered window. A day-sum page takes `limit` as asked (up to the list's 5000); a sleep page holds at most 1000 nights, and `meta.limit` echoes the value applied.",
       requestParams: {
         query: listMeasurementsSchema,
       },
diff --git a/tests/integration/measurements-day-grouped-paging.test.ts b/tests/integration/measurements-day-grouped-paging.test.ts
index 85d60a3a9..738a86f6d 100644
--- a/tests/integration/measurements-day-grouped-paging.test.ts
+++ b/tests/integration/measurements-day-grouped-paging.test.ts
@@ -88,7 +88,10 @@ async function seedSession(username: string) {
     },
   });
   const session = await prisma.session.create({
-    data: { userId: user.id, expiresAt: new Date(Date.now() + 60_000) },
+    // An hour, not a minute: walking every page of a long history can
+    // outlast a minute on a loaded runner, and an expired session reads as
+    // a 401 halfway through.
+    data: { userId: user.id, expiresAt: new Date(Date.now() + 3_600_000) },
   });
   cookieJar.set("healthlog_session", session.id);
   return user;
@@ -207,7 +210,7 @@ describe("GET /api/measurements?groupBy=day paging (#1245)", () => {
     ).json()) as ListEnvelope;
     expect(past.data.measurements).toEqual([]);
     expect(past.data.meta.total).toBe(expected.size);
-  });
+  }, 240_000);
 
   it("starts at the oldest day ascending and counts only the filtered window", async () => {
     const user = await seedSession("day-paging-window-user");
@@ -235,5 +238,5 @@ describe("GET /api/measurements?groupBy=day paging (#1245)", () => {
     }
     expect(windowed.data.meta.total).toBe(inWindow);
     expect(windowed.data.measurements).toHaveLength(PAGE);
-  });
+  }, 240_000);
 });
diff --git a/tests/integration/measurements-sleep-list.test.ts b/tests/integration/measurements-sleep-list.test.ts
index 2044d7d74..5db0eaf56 100644
--- a/tests/integration/measurements-sleep-list.test.ts
+++ b/tests/integration/measurements-sleep-list.test.ts
@@ -66,7 +66,10 @@ async function seedSession(username: string) {
     data: { username, email: `${username}@example.test`, role: "USER" },
   });
   const session = await prisma.session.create({
-    data: { userId: user.id, expiresAt: new Date(Date.now() + 60_000) },
+    // An hour, not a minute: walking every page of a long history can
+    // outlast a minute on a loaded runner, and an expired session reads as
+    // a 401 halfway through.
+    data: { userId: user.id, expiresAt: new Date(Date.now() + 3_600_000) },
   });
   cookieJar.set("healthlog_session", session.id);
   return user;
@@ -287,5 +290,61 @@ describe("GET /api/measurements?type=SLEEP_DURATION", () => {
     ).json()) as ListEnvelope;
     expect(drill.data.measurements).toHaveLength(1);
     expect(drill.data.measurements[0].sleepStage).toBe("CORE");
+  }, 240_000);
+
+  // Review finding on the SQL paging: the page labels a session by the last
+  // row of ANY writer, the reconstruction by its winning writer. A watch that
+  // stops before midnight beside a phone whose in-bed span runs past it gave
+  // two different days, and matching by label dropped the night from both.
+  it("keeps a night whose losing writer runs past midnight", async () => {
+    const prisma = getPrismaClient();
+    const user = await seedSession("sleep-midnight-user");
+    await prisma.user.update({
+      where: { id: user.id },
+      data: { timezone: "UTC" },
+    });
+    const base = {
+      userId: user.id,
+      type: "SLEEP_DURATION" as const,
+      unit: "minutes",
+      source: "APPLE_HEALTH" as const,
+    };
+    await prisma.measurement.createMany({
+      data: [
+        // The watch wins the device ladder and ends at 23:50.
+        {
+          ...base,
+          value: 420,
+          measuredAt: new Date("2026-03-10T23:50:00.000Z"),
+          externalId: "uuid-watch-core",
+          sleepStage: "CORE" as const,
+          deviceType: "watch",
+        },
+        // The phone's in-bed span ends at 00:20 the next day.
+        {
+          ...base,
+          value: 450,
+          measuredAt: new Date("2026-03-11T00:20:00.000Z"),
+          externalId: "uuid-phone-inbed",
+          sleepStage: "IN_BED" as const,
+          deviceType: "phone",
+        },
+      ],
+    });
+
+    const list = (await (
+      await callList("type=SLEEP_DURATION")
+    ).json()) as ListEnvelope;
+    expect(list.data.meta.total).toBe(1);
+    // The night is listed, not lost between two labels.
+    expect(list.data.measurements).toHaveLength(1);
+    const [night] = list.data.measurements;
+    expect(night.value).toBe(420);
+
+    // Its drill-down, asked by the label the list gave it, finds it too.
+    const drill = (await (
+      await callList(`type=SLEEP_DURATION&dayKey=${night.dayKey}`)
+    ).json()) as ListEnvelope;
+    expect(drill.data.measurements.map((m) => m.sleepStage)).toEqual(["CORE"]);
   });
 });