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.

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

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 ...

On an Apple Watch, "core sleep" is another name for light sleep, which scientists also call stages N1-N2. It is not a type of ...

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

Waking up after eight hours of sleep should feel refreshing. Yet, many people open their eyes feeling just as exhausted as when they went to bed. It's ...

A new study suggests that insufficient slow-wave and REM sleep may accelerate brain deterioration associated with Alzheimer's ...

Heart rate, breathing, and brain waves become more regular. Stage 3 is also called slow-wave sleep. Stage 4: This stage is ...

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

or REM, sleep — may hasten the deterioration of parts of the brain associated with Alzheimer’s disease, a new study found. Deficits in slow-wave and REM sleep appear to shrink parts of the ...