This article includes Supplementary Video, available online at .

jws-mds.20645.mpg10814K Episodes of propriospinal myoclonus in the lying position. Occurrence of jerks during wakefulness (first episode) and during sleep after arousal due to a cough (second and third episodes). Occurrence of jerks in wakefulness during a painful lying position (last three episodes). This video presentation has been abbreviated. The full version will appear on theMovementDisorders DVD Supplement, which is issued bi-annually.

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