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A myclonic twitch or hypnagogic myoclonus consists of one or more sudden full-body twitches, and often preceded by a sensation and/or dream of falling. The twitches occur during very light sleep as the conscious brain relinquishes control of the body's motor functions. While not a cause for medical concern, these twitches can be startling. The cause of myclonic twitching is unknown: they appear to be associated with (a) anxiety and (b) faint stimulus.
See also: sleep apnea
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