If thine muscle offends thee CUT IT OUT

My leg has been twitching for a week or so now, which is annoying in any case, but now it's starting to affect my sleep, and I am getting CROSS. The internet found me a list of possible causes (it also found me certain proof that I'm going to die from metal poisoning, but the list seemed more sensible), and the only ones that it might be are muscle strain (though I'm surely not active enough to have incurred a proper physical injury), and emotional stress or anxiety, which seems much more likely but is also something I can't really do anything about.

There isn't really any helpful information on how to STOP THE DAMN TWITCHING, but I wonder if it's just that no-one's tried stabbing the offending limb into submission? At the very least it would give me another sensation on which to focus.