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.

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.

Not spending enough time in the two deep stages of sleep — slow-wave and rapid eye movement, or REM, sleep — may hasten the ...

A new study reveals that not getting enough of specific stages in the sleep cycle may be linked to cognitive decline and ...

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

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

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 ...

During deep sleep, the brain sweeps out toxins and dead cells while also repairing and restoring the body for the next day. While we dream during REM sleep, the brain is busy processing emotions ...