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.

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

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

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 ...

Need another reason to prioritize your sleep? Not spending enough time in the two deep stages of sleep may hasten the ...

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

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 cognitive function is still being explored. And now, new research has ...

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