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.

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 ...

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

Working shifts disrupts your circadian rhythm, leading to poor sleep efficiency and mood disturbances. We take a closer look ...

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

The idea that you can make up for lost sleep over the weekend is a myth. The "sleep debt" you accrue from not getting enough ...

Sleep quality matters more than quantity. Learn why you might still feel tired despite getting eight hours of sleep and how ...

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.