I have started feeling like my body was "vibrating" - not spasms, or jerking - like there is a vibrator in my body. Feel it most in the back, but everywhere else too. Mostly happens when I am sleeping or relaxed - it will wake me up, but has happened once when standing. Does not hurt - just very disconcerting. What is it? Who do I go to for it? What words do I use to check the internet?