Medically reviewed by Sanja Jelic, MD Key Takeaways The sleep cycle has three NREM stages and one REM stage.Deep sleep occurs in stage 3 and is crucial for feeling refreshed.REM sleep helps in ...

Have you ever jolted awake in the middle of the night, heart racing, drenched in sweat, with no memory of what happened?

Understanding the dynamic neural mechanisms of sleep-wake cycles is a major challenge in sleep science and neuroengineering.

A restful night alternates in cycles between non-rapid eye movement (NREM) and rapid eye movement (REM) sleep states. The study from UNIL shows that a brain region called the "locus coeruleus" (in ...

A new study uncovers a precise brain pathway that rapidly converts emotional stress into sudden wakefulness during NREM sleep.

This is the second in a series of columns about the importance of adequate sleep for optimal physical and mental health. These columns are based on the book “Why We Sleep,” by PhD sleep scientist ...

You’ve heard of REM sleep but what about deep sleep? Experts share why it’s important and how to make sure you’re getting enough of it.

For every 1 gram per kilogram increase in alcohol dose, REM sleep duration was reduced by 40.4 minutes. Alcohol consumption adversely affects rapid eye movement (REM) sleep in a dose-dependent manner, ...

In the last post, I discussed how dreams are composed of information that is received during the day before the dream and then integrated with previously stored information. Whether there are other ...