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REM sleep intrusion

A brief interval of REM sleep appearing out of its usual position in the non-REM-REM sleep cycle; an interposition of REM sleep in non-REM sleep; sometimes appearance of a single, dissociated component of REM sleep (e.g., eye movements, "drop out" of muscle tone) rather than all REM sleep parameters.
Credit

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