Researchers have discovered that positive emotions enhance perceptual memories during sleep, particularly in the non-REM stage.

A multiple sleep latency test (MSLT) is an objective way to measure sleep quality. It helps diagnose narcolepsy and insomnia.

REM follows three phases of non-REM sleep, each deeper than the last. The four phases take 90 minutes or more to complete, depending on age, and a person may cycle through them four or five times ...

Now, a study suggests that people who take significantly longer to start the dream phase of sleep, known as rapid eye movement (REM), may be experiencing an early symptom of the disease. REM follows ...

REM follows three phases of non-REM sleep, each deeper than the last. The four phases take 90 minutes or more to complete, depending on age, and a person may cycle through them four or five times ...

REM follows three phases of non-REM sleep which go from light to deep sleep. Older people take longer to reach REM. During REM sleep the brain processes memories, especially those that are ...

People who take longer to get to the dreaming part of the sleep cycle are more likely to develop dementia, a new study suggests. Taking longer to enter the dream phase — known as rapid eye ...

Brain recordings showed that these three brain regions were cooperatively activated in the learning periods and reactivated during early non-REM sleep, but not during REM sleep, to reinforce the ...