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 ...

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

If you're on the fence about the best sleep masks, know that there are two types of sleepers in this world: Those who can ...

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

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

Healthy sleep includes multiple components, such as number of hours of sleep per night, how long it takes to fall asleep, ...

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.

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

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

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 ...