SUMMARYThis study sought to determine if there is any overlap between the two major NREM and REM parasomnias, i.e., sleepwalking/sleep terrors (SW/ST) and REM sleep behaviour disorder (RBD). We assessed adult patients with SW/ST using RBD screening questionnaires and determined if they had enhanced muscle tone during REM sleep.Conversely, we assessed RBD patients using the Paris Arousal Disorders Severity Scale (PADSS) and determined if they had more N3 awakenings. The 251 participants

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