Your Sleep Tracker Knows How Long You Slept. Not How Deeply
Every tracker in the lab studies could tell when people were asleep; none could reliably say how deeply, least of all in older adults and patients.
Topic
Wearables & Body Rhythms
Wearables and the signals they can actually support: rhythms, sleep, and the line between a pattern and a cause.
Your Body Clock Leaves a Signature on Your Wrist
809 adults, seven days of wrist sensors: robust temperature rhythms tracked with better metabolic markers, light with lower triglycerides. Association only.
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