I've just started experiencing these sensations recently. Yesterday was kind of annoying. I was laying down after my head started to hurt. And it was like my arm and leg muscles were being zapped to flex then release. This went on for a while. I finally fell asleep. I almost wonder if it wasn't from not being tired and wanting to keep going, but I'm not sure. Any one else have this happen? Haven't had any med changes in a month plus. My arms and legs do go to sleep a lot. But my PCP thinks that's from carpal tunnel, maybe connected?