During the past 4 or 5 months (it may be longer). I have beeb exeperiencing such spasms. I first noticed my left thigh muscle fluttering for want of a better word. Since then it happens randomly, it could be my arms, legs, backside, temple, back, chest, abdomen etc. It only seems to happen when Im not moving about and therefore isnt hindering me, but its a bit strange. Ive been to the doctors and had a full physical and a blood test. Results of both were normal. The muscle spasm or flutter is more evident if its a big muscle i.e. biceps or thigh etc. At most it lasts say 3-4 secs but only ever seems like a second in the little areas.