Analysis of polysomnographic events surrounding 252 slow-wave sleep arousals in thirty-eight adults with injurious sleepwalking and sleep terrors

A systematic study of electrophysiologic events [eight-channel EEG, electro cardiogram, electromyogram (EMGs)] surrounding 252 arousals from slow-wave sleep (SWS) in adults with sleepwalking (SW) and sleep terrors (ST) is repo rted. Hospital-based, overnight polysomnographic monitoring was conducted i n 38 adults presenting to a sleep disorders center with injurious SW, ST (2 1 males, 17 females; mean age 29 years, range 17-69 years). Before nonbehav ioral or behavioral arousals from SWS, neither EEG "delta wave buildup," no r heart rate (HR) acceleration, nor tonic/phasic EMG activation was identif ied. The postarousal EEG demonstrated three patterns: (a) diffuse, rhythmic , delta activity with a typical frequency of 2.2 Hz, a typical amplitude of 85 mu V, and a typical duration of 20 s; (b) diffuse delta and theta activ ity intermixed with alpha and beta activity; and (c) prominent alpha and be ta activity. Multichannel, high-voltage, delta activity was observed in <2% of all prearousal periods. HR acceleration emerged abruptly with SWS arous als: with significant changes in mean pre- versus postarousal HR (p < .001) . Macrostructural sleep parameters ("sleep architecture") were intact. Ther efore, our findings in adults with SW, ST strongly support the classificati on of SW/ST as disorders of (abrupt) arousal.