Sleep paralysis is an REM sleep parasomnia characterized by an inability to perform voluntary movements associated with marked anxiety that occurs either at sleep onset (hypnagogic form) or on awakening (hypnopompic form). Attacks last a few minutes, do not involve respiratory and ocular muscles, are fully reversible, and often are accompanied by terrifying hallucinatory phenomena. Sleep paralysis is frequently associated with narcolepsy, but may be familial.
May. 24, 2021