REM stands for Rapid Eye Movement and this is a stage of sleep wherein people are known to be in their deepest sleep. About 25% of your sleep time is in REM. When you start sleeping, REM may come in bursts but as you sleep longer, it will also allow you to experience this longer.
NREM stands for all of the stages of sleep. This is not limited to REM alone. This will show the stages of sleep that the person may experience from the lightest which is labeled as “1” and the deepest is labeled as “4.” It is during stages 3 and 4 that the restoration of the body’s cells occurs.
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