As long as I can remember I've had a muscle twitching somewhere on my body. Eyes, legs, elbows, knees, fingers ... sometimes even my tongue! They're generally small to be unnoticeable but for one thing. I touch and feel them - for example I might be holding my elbow if there's one there I'll also watch them if it's reasonably convenient. Yes it makes me look a little strange at times, but so what. It's no more remarkable than any other stimming! I've always wondered why this is such a constant for me. Any time I've asked a doctor they say it's stress. All my life?! ! I doubt that! My theory is that it's a neuro oddity which may or may not be related to autism.