Exercise?: There are not many details to go by in this question. If you were doing a lot of abdominal and leg exercise earlier in the day the muscle might shake from fatigue. Restless legs can give a sensation of movement. Shaking is a not a familiar symptom of internal disease, or urinary infections, unless the whole body shook, and you had a fever.
Answered 9/22/2012
5.6k views
Myoclonus?: Some folks' bodies jerk as they are falling asleep, they may experience this as pleasant or unpleasant (myoclonus). The entity to rule out is restless legs which can be a life-ruiner. Please read up on both, and thanks for asking.
Answered 3/26/2013
5.6k views
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