Smartwatch makers promise to turn your wrist into a sleep lab, translating tiny movements and heart rate blips into colorful ...

How accurate is your smartwatch? Learn how Apple and Samsung smartwatches use motion and HR to track sleep, and why you ...

During REM sleep, your heart rate increases, your blood pressure elevates, and your eyes move. REM sleep may also be the time when your brain processes emotions and solidifies memories. Your body ...

Research suggests that both REM (rapid eye movement) and NREM (non-rapid eye movement) stages in the sleep cycle are ...

As maddening as nonrestorative sleep night after night can be, the consequences go much deeper. Left unaddressed, sleep apnea ...

Any sleep tracker will show you that slumber is far from a passive affair. And no stage of sleep demonstrates that better than rapid eye movement, or REM, commonly called dream sleep. “It’s also ...

Light sleep is the beginning of your sleep cycle and your body's way of winding down. Breathing, heart rate and muscle changes prepare your body for the deeper sleep to come. Light sleep is broken ...

Couples sleeping together, as opposed to separately, was associated with increased rapid-eye movement (REM) sleep and greater sleep synchronization, potentially caused by a positive feedback loop, ...

A systematic review found improved sleep quality and longer REM sleep after endoscopic surgery for chronic rhinosinusitis ...

A quick surge of dopamine shifts mice into a dreamy stage of sleep. In the rodents’ brains, the chemical messenger triggers rapid-eye-movement sleep, or REM, researchers report in the March 4 Science.