The brain waves during stage 1 NREM sleep transition from daytime patterns to nighttime patterns. Stage 2 NREM sleep is when most people would consider themselves to be "asleep." The heart rate ...

REM sleep goes even deeper into brain recovery, dreaming and processing memories and emotions. This is the sleep stage in ...

That means stages 1 and 2, which are sometimes called ... dreams can occur in other stages as well). The brain waves of a person in REM sleep look very similar to those of a person who is ...

This state of decreased activity is also a more effective time for the body to heal injuries and fight infections.

A good night’s sleep isn’t just about the number of hours you log. Getting quality sleep — the kind that leaves you feeling ...

Scientists call this stage 1, the shallow end of sleep. It lasts maybe ... which differ in the percentage of brain activity that’s composed of big, rolling delta waves, as measured on an EEG.

Hallucinogens like DMT, psilocin, and LSD might rewrite the rules of sleep, blurring the line between dreams and reality.

DARIEN, IL — New research reveals that lower proportions of specific sleep stages ... spent in slow wave sleep and rapid eye movement sleep had smaller volumes in critical brain regions ...

While the verdict on its cause is not clear, Alzheimer's is thought to be caused by a combination of factors, including abnormal protein buildup (plaq ...