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ABC of sleep disorders. Parasomnias.

Parasomnias are a group of acute, undesirable, episodic physical phenomena that usually occur during sleep, or are exaggerated by sleep. They are characterised by partial arousals before, during, or after the event even though they occur during different stages of sleep and at different times during the night. Most parasomnias are precipitated or perpetuated by stress, and an interaction between biological (often not identified) and psychological factors is presumed in many. There are three different types: those that occur during slow wave sleep, rapid eye movement (REM) sleep, and any phase of sleep.