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Definition of NREM Sleep


Updated February 19, 2014

Definition: This is one of the two basic states of sleep and is notable for an absence of rapid eye movement (REM). It consists of three stages (N1, N2, and N3) of distinctly recognizable electrical brain wave patterns. It makes up the largest portion of the sleep cycle.
Also Known As: Non-rapid eye movement sleep
NREM sleep is the most common type of sleep during the night.
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