I have had this several times too. Once when I was reading while laying down on the couch and using my neck muscles to lift my head for a long period. The other time it was while riding in the car. I knew it wasn't my pulse because I felt it without touching it. Basically, I have had so much muscle movement in so many places I haven't before all in a short period that it is clear that I have a problem. No new twitch will really adds to the analysis for me at this point. I am now more fearful of increased severity or duration of twitches or other nontwitching symptoms.Krackersones