The diagnostic criteria of REM sleep behaviour disorder are as follows. (!,,34)
1. Polysomnographic abnormality during REM sleep: elevated submental electromyographic tone and/or excessive phasic submental and/or limb electromyographic twitching.
2. Documentation of abnormal REM sleep behaviours during polysomnographic studies, or a history of injurious or disruptive sleep behaviours.
3. Absence of EEG epileptiform activity during REM sleep.
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