A myclonic twitch
or hypnagogic myoclonus
consists of one or more sudden full-body twitches, and often preceded by a sensation 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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