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Marc-André Bombeck
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Polar exposes only per-stage duration totals, so its mapper already reconstructs a contiguous CORE-DEEP-REM order exactly like WHOOP and flags each segment reconstructed. The night reader's honesty allow-list only held WHOOP, so a Polar-won night was served with reconstructed:false — presenting a synthetic stage order to web and iOS as if it were the device's measured timing. Add POLAR to the allow-list so the layout is labelled approximate. Polar's total_interruption_duration carried the night's awake time but was dropped, so every Polar night read as fully consolidated (awakeMinutes:null, awakenings:0) with overstated asleep-vs-in-bed efficiency. Lay it as a leading AWAKE segment so the asleep stages partition the remaining window and the reader surfaces real awake time. WHOOP and Polar independently implemented the same contiguous-timeline walk. Extract a shared reconstructContiguousSleepTimeline helper under src/lib/sleep and call it from both; each mapper keeps only its field normalisation. Oura's measured 5-min hypnogram is a different algorithm and is left untouched.