REM sleep is the sleep phase characterised by Rapid Eye Movements. Other criteria for REM sleep include low muscle tone and rapid, low voltage electrical activity. These features are easily discernible in a polysomnogram. REM sleep usually occurs for 20–25% of the total time spent sleeping. During REM sleep, brain cells are acting as during waking hours, but the body is paralysed. It is during REM sleep that we dream and consolidate memories.
For more information, see Sleep Physiology.
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