diff --git a/src/lib/__tests__/doctor-report-recovery-canonical.test.ts b/src/lib/__tests__/doctor-report-recovery-canonical.test.ts
index 8f23d122e..9042098fa 100644
--- a/src/lib/__tests__/doctor-report-recovery-canonical.test.ts
+++ b/src/lib/__tests__/doctor-report-recovery-canonical.test.ts
@@ -14,11 +14,14 @@ describe("summariseCanonicalRecovery", () => {
     ).toBeNull();
   });
 
-  it("prefers the WHOOP-native row over the COMPUTED proxy per day", () => {
-    // The same day has a low proxy AND a high native row. The PDF must read the
-    // native value, not blend both into one average.
+  it("prefers the WHOOP-native row over the COMPUTED proxy per night", () => {
+    // ONE physiological night (wake morning Jun 1) carries both rows on their
+    // real, off-by-one stamps: WHOOP stamps the wake morning (Jun 1), the
+    // COMPUTED proxy stamps the day that ended (May 31 noon). The resolver
+    // shifts the proxy onto the wake day so they collapse to one night, and the
+    // PDF reads the native value, not a blend.
     const summary = summariseCanonicalRecovery([
-      m("RECOVERY_SCORE", 50, "2026-06-01T12:00:00Z", "COMPUTED"),
+      m("RECOVERY_SCORE", 50, "2026-05-31T12:00:00Z", "COMPUTED"),
       m("RECOVERY_SCORE", 80, "2026-06-01T06:00:00Z", "WHOOP"),
     ]);
     expect(summary).not.toBeNull();
@@ -30,14 +33,18 @@ describe("summariseCanonicalRecovery", () => {
     expect(summary!.count).toBe(1);
   });
 
-  it("summarises across days using one canonical row each", () => {
+  it("summarises across nights using one canonical row each", () => {
+    // Night A (wake Jun 1): WHOOP 80 + its COMPUTED proxy 40 (stamped May 31
+    // noon) collapse to the native 80. Night B (wake Jun 2): a COMPUTED-only
+    // proxy 60, stamped Jun 1 noon, stands alone.
     const summary = summariseCanonicalRecovery([
-      m("RECOVERY_SCORE", 60, "2026-06-02T12:00:00Z", "COMPUTED"),
+      m("RECOVERY_SCORE", 60, "2026-06-01T12:00:00Z", "COMPUTED"),
       m("RECOVERY_SCORE", 80, "2026-06-01T06:00:00Z", "WHOOP"),
-      m("RECOVERY_SCORE", 40, "2026-06-01T12:00:00Z", "COMPUTED"),
+      m("RECOVERY_SCORE", 40, "2026-05-31T12:00:00Z", "COMPUTED"),
     ]);
     expect(summary!.count).toBe(2);
-    // Canonical set: 06-02 COMPUTED 60, 06-01 WHOOP 80 (proxy 40 dropped).
+    // Canonical set: night B COMPUTED 60 (latest stamp), night A WHOOP 80
+    // (proxy 40 dropped).
     expect(summary!.latest).toBe(60);
     expect(summary!.min).toBe(60);
     expect(summary!.max).toBe(80);
diff --git a/src/lib/doctor-report-data.ts b/src/lib/doctor-report-data.ts
index a86fd8282..9e33e35b1 100644
--- a/src/lib/doctor-report-data.ts
+++ b/src/lib/doctor-report-data.ts
@@ -252,6 +252,7 @@ interface RecoveryMeasurementRow {
  */
 export function summariseCanonicalRecovery(
   measurements: readonly RecoveryMeasurementRow[],
+  timezone?: string | null,
 ): WellnessScoreSummary | null {
   const recovery = measurements.filter((m) => m.type === "RECOVERY_SCORE");
   if (recovery.length === 0) return null;
@@ -261,6 +262,7 @@ export function summariseCanonicalRecovery(
       measuredAt: m.measuredAt,
       source: m.source,
     })),
+    timezone,
   );
   if (canonical.length === 0) return null;
   // `resolveCanonicalRecovery` returns rows newest-first; the report wants the
@@ -996,7 +998,7 @@ export async function collectDoctorReportData(
   // the SAME value the tile + iOS feed show — one number, one engine.
   const wellnessScoreSummaries = WELLNESS_SCORE_REPORT_TYPES.flatMap((type) => {
     if (type === "RECOVERY_SCORE") {
-      const summary = summariseCanonicalRecovery(measurements);
+      const summary = summariseCanonicalRecovery(measurements, reportTz);
       return summary ? [summary] : [];
     }
     const s = stats[type];