Non-REM SLEEP. By Drew Brenner. The four stages of sleep during which the sleeper does not experience rapid eye movement (REM) sleep. They average sleep cycle lasts about 90 to 100 ...

... the rhesus monkey) is followed by a brief awakening; this does not occur for either cats or humans, although humans are more likely to wake from REM sleep than from non-REM sleep.

non-REM sleep   (n n r m) A period of sleep characterized by decreased metabolic activity, slowed breathing and heart rate, and the absence of dreaming.

The sleep stages 1 through 4 are collectively referred to as NREM (non-rapid eye movement) sleep. Rapid eye movement (REM), or stage 5, is not included.

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