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

Is it easier to fall asleep in low gravity?” and other spaceflight questions, answered by two NASA sleep scientists.

Oura Ring and Apple Watch are the most popular wearables for tracking your health and fitness. A longevity expert talks ...

Sleep trackers are supposed to help us get better rest. Stressing metrics can be counter-productive, experts say ...

Next to REM sleep ... and your brain waves start to look different than they do when you’re awake. This would be considered part of your “light” sleep. The Apple Watch considers this ...

After analyzing many previous studies on lucid dreaming, researchers have defined it as a state that differs significantly ...

When I wrote my review of the Whoop 4.0, I kept it to the basics—how the strap looks, works, and charges, and what it can ...

Researchers at Ludwig Maximilian University of Munich found that moderate alcohol consumption transiently raises nocturnal ...

like rapid-eye movement sleep, Goldstein said. A variety of metrics are typically used to measure REM sleep, including eye movement. “People get really excited or upset about how much REM sleep ...

Medically reviewed by Smita Patel, DO Hypersomnia and narcolepsy are both sleep disorders that cause excessive daytime ...

A person’s sleep needs are highly individual, Holliday-Bell says. If you feel refreshed and ready for the day after nine ...