ok, has been happening for years. it doesn't effect me, it is more annoying than anything. what happens is when I am sitting or laying down I feel this tingling or tickling feeling in my right lower back. just above my hip. sometimes in my left but 99% of the time on my right side. after I feel the tickle or tingle a few seconds later my back does this hard spasm in the area of the tickle or tingle and jerks my whole body. it might happen once a day or several times a day. like I said it does not effect me in anyway other than it is annoying. especially when it happens in public.