REM sleep


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rap·id eye move·ment sleep

, REM sleep
that state of deep sleep in which rapid eye movements, alert EEG pattern, and dreaming occur; several central and autonomic functions are distinctive during this state.
Farlex Partner Medical Dictionary © Farlex 2012

REM sleep

n.
A period of sleep during which dreaming takes place, characterized by rapid periodic twitching movements of the eye muscles and other physiological changes, such as accelerated respiration and heart rate, increased brain activity, and muscle relaxation. REM sleep is the fifth and last stage of sleep that occurs in the sleep cycle, preceded by four stages of non-REM sleep. Also called paradoxical sleep.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

REM sleep

Rapid eye movement sleep, desynchronized sleep, paradoxical sleep Neurology A 5 to 20 min segment of a normal sleep cycle, characterized by irregular heart rate and respiration, BP, EEG similar to awake and alert state, involuntary or jerky muscle movement, and higher threshold for arousal; the usual high-amplitude slow brain waves seen by EEG are replaced by rapid eye movement and rapid, low-voltage irregular EEG activity. See Insomnia, Sleep disorders.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

REM sleep

Rapid eye movement sleep. This occurs during about 20% of the sleeping time and features constant movement of the eyeballs, twitching of the muscles and erection of the penis in men. REM sleep is deep and is associated with dreaming. It is necessary for health.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

REM sleep

Rapid Eye Movement phase of sleep, a mentally active period during which dreaming occurs.
Mentioned in: Night Terrors
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
A variety of physiological and behavioural changes occur during normal wakefulness, NREM and REM sleep (21) (Table II).
The TST was higher in the exposed group (by 10.7 min) as a result of significant increase in the total duration of REM sleep and nonsignificant trend of increase of NREM (by 1.8 min and 8.9 min, respectively; p = 0.037 and p = 0.057).
Firstly, the patients must have repeated episodes of complex motor behaviors or vocalization during REM sleep, and they can be documented by PSG or reports of dream enactment.
"We set out to discover which stages of sleep may be linked to dementia and while we did not find a link with deep sleep, we did with REM sleep."
'People who go to bed after midnight miss this stage and sleep is often restless.' We've evolved to go to bed between 8pm and midnight for the ideal ratio of light, deep and REM sleep.
It has been widely believed that REM sleep helps in memory consolidation, which means converting short-term memory into long-term memory.
When cosleeping, objective total sleep time and sleep efficiency increased significantly, as did total N3 and REM sleep duration and REM sleep proportion (Table 1 and Figure 1).
McNamara proposes and explores the theory that a key source of religious beliefs is REM sleep and dreams.
Following the exercise, the scientists altered one group of mice by deactivating a specific cluster of cells in a key memory region called the hippocampus that are normally active during REM sleep. The following day, compared to the group of mice that were unaltered and experienced normal REM sleep, the mice with the "switched-off" cells were unable to recall spatial memory tasks they had learned the previous day.
Recent studies specifically looking at REM sleep and memory have provided us with valuable information about the important potential role of REM sleep and memory.
Brain waves during REM sleep solidify memories in mice, researchers report in the May 13 Science.