Sleep Tracker Accuracy: What Oura, Whoop, and Apple Watch Are Actually Measuring
You wake up. Before your feet hit the floor, you check your sleep score. The little device on your finger or wrist (or under your mattress, or on your bedside table) has rendered its verdict on the night. 87 — great day ahead. 64 — brace yourself. 42 — something’s wrong. The numbers shape your
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