I started getting strange muscle twitches last semester after I started taking caffeine pills. Now this summer, when I don't sleep enough, I get them every time. Sometimes it's something small like a toe moves on its own, on and off, for a few hours. But sometimes it is down right annoying such as my left bicep twitches or a back muscle will start. Being these are larger muscles, I worry it is noticeable to others. What is causing this and how do I stop it?