Non-REM Parasomnias and REM Sleep Behaviour Disorder
Parasomnias are undesirable physical events or experiences associated with sleep. Episodes are usually classified according to the stage of sleep during or from which they occur. Parasomnias frequently involve complex behaviours that may appear purposeful but are not conscious or under deliberate control. Patients are often unaware of episodes that may, however, result in injury and sleep disruption with subsequent daytime symptoms such as excessive daytime somnolence. The consequences of parasomnias are not limited to the patient but often affect the bed partner as well. People are often amnesic for their parasomnia but, with both non-REM parasomnias and REM sleep behaviour disorder (RBD), patients may recall some dream mentation.
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