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

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 ...

Sunlight plays a huge role in our energy levels and sleep quality. One study found that those who got enough morning sunlight ...

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 ...

Get a deeper understanding of the health metrics your smartwatch measures for you, so you can make full use of them.

While we dream during REM sleep, the brain is busy processing emotions, consolidating memories and absorbing new information. It makes sense that getting quality deep and REM sleep is key to our ...

Au contraire, sleepy Pierre. You can get a solid eight hours and still be woefully lacking in “deep sleep” (the most important restorative rest) and REM sleep (most important for memory.) ...

Au contraire, sleepy Pierre. You can get a solid eight hours and still be woefully lacking in “deep sleep” (the most ...

Eyeing their first-ever Official Singles Chart entry this week, English heavy metal outfit Sleep Token bag a Trending Chart entry with Emergence this week; new in at Number 4. The Official ...