sleep disorders medicine: sleep stage non-REM
The other major sleep state apart from REM sleep; comprises sleep stages one, two, three, four, which constitute levels in the spectrum of non-REM sleep "depth" or physiologic intensity.*
Also: non-rapid eye movement (NREM) sleep
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann