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, ...

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 ...