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Rapid eye movement

Rapid eye movement (REM) is the stage of sleep characterized by rapid saccadic movements of the eyes.

During this stage, the activity of the brain's neurons is quite similar to that during waking hours.

Most of the vividly recalled dreams occur during REM sleep.

It is the lightest form of sleep, and people awakened during REM usually feel alert and refreshed.

Note:   The above text is excerpted from the Wikipedia article "Rapid eye movement", which has been released under the GNU Free Documentation License.
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