Hello sir. One my friend having an issue whether its big or not I don't know but I noticed him when ever he didn't take enough sleep he just do like odd thing he suddenly shakes his body like jumps his whole body or we could say like jerks his body when I asked him he says he can't control that it occurs automatically when he doesn't take enough sleep. I am worried about him doc. Can you just tell me the exact reason and the solution for this issue.