I ve been having shakes during the night since about 2 months. These are not regular; I ve only experienced these about 5 or 6 times, but it seems to be getting more common (they didn t occur for about a month after the first time, but now they have happened two nights in a row twice - once last week and now these past two nights). These shakes wake me up at about 5 or 6am, start in my legs and continue to spread throughout my whole body. I feel fine mentally while they occur, not stressed or scared, and they usually last about 10-30 minutes, although the first time I had these they lasted about 1.5 hours.