Yeah, I think they are just deep twitches that are just a little more rapid and more constant. When I feel it in my upper arms I can see the muscles bouncing slightly. But I have to look carefully to see it. Its weird though because its so systemic. I've been having a real spike in twitching the past few days and I was lying in bed with my arms, legs, and back just rumbling and random pops and machine gun twitches (like 10 quick ones in a row in the same spot) absolutely everywhere. The small muscles of my hand have been acting up too. Twitching in my palm, thenar muscle, between my thumb and index, and in the small muscles on top of my hand between the knuckles. I wish I knew what was causing the increase in twitching but I really can't put my finger on it. I haven't done anything out of the ordinary. Who knows.