REM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.

If you give your body enough time to find the beat, you’ll notice differences not only in how you sleep but also how you feel ...

Sleep deprivation creates dangerous conditions for heart attacks. Learn how skipping sleep triggers inflammation, raises ...

A vast majority of Americans wake up regularly during the night, according to a U.S. News survey. Sleep expert Wendy Troxel ...

Deep sleep is the restorative stage of sleep. During this stage the body undergoes tissue repair, the immune system is ...

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

People who have disrupted circadian rhythms suffer all kinds of negative effects, including higher rates of obesity, sleep ...

Waking up tired or wired? Your circadian rhythm could be off. Reset your internal clock with science-backed habits for deeper ...

Discover 7 delicious nighttime snacks that actually improve sleep quality while satisfying cravings. Learn which foods to ...

Is sleep tracking actually useful in daily life, or is it just data overload distracting you from what matters? After ...