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non-REM sleep intrusion

An interposition of non-REM sleep, or a component of non-REM sleep physiology (e.g., elevated EMG, K complex, sleep spindle, delta waves), in REM sleep; a portion of non-REM sleep not appearing in its usual sleep cycle position.

Definition reprinted with permission from Culebras, Antonio, Clinical Handbook of Sleep Disorders, Butterworth-Heinemann