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My wearable often gives me a high sleep score after a night when I wake up groggy and struggle to focus. On other mornings, I feel fine even though the tracker reports several wake-ups.
How much can wrist-based devices actually infer about sleep stages from movement and heart rate? I’m wondering whether the mismatch reflects limits in sleep tracker accuracy, an issue with how the score is calculated, or something worth discussing with a healthcare professional.
