If you use a sleep tracker at night, these are the three metrics you should be paying attention to in the morning.

Smartwatch makers promise to turn your wrist into a sleep lab, translating tiny movements and heart rate blips into colorful charts of deep, light, and REM sleep. The pitch is seductive: better data, ...

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 ...

Sleep has become the new frontier of performance, recovery, and overall health — and wearables have rushed in to promise deeper insight than ever. From rings and watches to bedside sensors and ...

Many smartwatches, fitness and wellness trackers now offer sleep tracking among their many functions. Wear your watch or ring to bed, and you'll wake up to a detailed sleep report telling you not just ...