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Sleep paralysis, nightmares and REM sleep behaviour disorder (RBD) are disorders arising from REM sleep.
Sleep paralysis and nightmares are recalled by the patient.
REM behaviour episodes are sometimes recalled but more often only apparent to the bed partner.
Sleep paralysis is a brief state of involuntary immobility usually occurring on waking from a night’s sleep or a nap (more rarely at sleep onset)
The attack may terminate spontaneously or following a stimulus such as a touch or a sound.