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

It's no secret that a good night's sleep is key to a healthy brain. However, the full extent of the importance of rest on our ...

New research shows that reduced time in slow wave and REM sleep is associated with smaller brain volumes in regions ...

Research reveals how specific sleep stages protect brain vulnerable to Alzheimer's, offering hope through simple lifestyle ...

What if we didn't need sleep to dream? Well, scientists may have found a way to hack those benefits even when you're awake.

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

The brain waves of a person in REM sleep look very similar to those of a person who is awake, which is why some sleep-tracking apps show blocks of REM as occurring near the top of the graph ...

Spending lower proportions of time in two deep sleep stages — including REM sleep — may be linked to volume changes in ...

Can poor sleep raise your risk of Alzheimer’s? A new study links reduced sleep stages to brain shrinkage in areas prone to ...

A new study from Yale School of Medicine has found that people who spend less time in deep sleep and dream-related sleep may ...