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.

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 ...

A new study reveals that not getting enough of specific stages in the sleep cycle may be linked to cognitive decline and potentially may lead to Alzheimer's disease. Researchers from the Yale School ...

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

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

A study published in the Journal of Clinical Sleep Medicine explores the association between sleep architecture and brain atrophy in regions vulnerable to | Neuroscience ...

Disrupted SWS (critical for waste clearance) and REM sleep (key for memory) may impair the glymphatic system, hindering the removal of Alzheimer’s-linked beta-amyloid plaques. The study suggests sleep ...