have you developed any strange cravings, like say, carrots for example? perhaps you were a rabbit in a former life? (lol)
but seriously.... it could be down to fatigue or stress. Involuntary spasms can be caused by many factors, including caffeine, certain types of medication, etc. If it persists or gets worse pop along to your GP.
BTW, I've had a twitchy eye lid for 3 days now but I really think it's down to lack of sleep and exam stress.
I have been experienced precisely the same symptoms today, and this is probably the fourth or fifth time I've experienced them in about two years (I didn't record any information from prior episodes). I'm a "twitchy" person in general, and always have been. What you're experiencing could be from anxiety, caffeine, completely random chaotic events in a bodily system tending towards entropy, or the very earliest stages of some awful neurological disease! I often find that massaging a place where twitching is occuring, or voluntarily contracting those muscles, will relieve the twitch.
Perhaps I'm weird, but I love twitches, be they nose, eyelid, calf, thumb, my belly or the top of my hand!