Your watch says you had three hours of deep sleep. Should you believe it? Millions of people rely on phone apps and wearable ...
Wearable health devices now track heart health, stress, glucose, fertility, and sleep, turning smart wearables into everyday ...
Over one-third of Americans use some sort of device to track their sleep, according to the American Academy of Sleep Medicine. CREDIT: whitebalaance.space via Getty Images. Get the Popular Science ...
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