Get a deeper understanding of the health metrics your smartwatch measures for you, so you can make full use of them.

REM sleep goes even deeper into brain recovery, dreaming and processing memories and emotions. This is the sleep stage in ...

A good night’s sleep isn’t just about the number of hours you log. Getting quality sleep — the kind that leaves you feeling ...

Hallucinogens like DMT, psilocin, and LSD might rewrite the rules of sleep, blurring the line between dreams and reality.

Not spending enough time in the two deep stages of sleep — slow-wave and rapid eye movement, or REM, sleep — may hasten the deterioration of parts of the brain associated with Alzheimer’s ...

These are not restless movements from bad dreams, but signs of a complex and often misunderstood sleep disorder—REM sleep behavior disorder, or RBD. RBD is a condition where people physically ...

A new study suggests that insufficient slow-wave and REM sleep may accelerate brain deterioration associated with Alzheimer's disease. Experts recommend maintaining deep sleep through a conducive ...