I'm a Twitcher

My left eye has been twitching all day. Could it be because I go to bed at three every morning? Perhaps because it took an hour and a translator and repeated entries of pin numbers of varying lengths to get a Korean bank account today? Am I tired, despite what the perpetual instant coffee drinks are telling me? Is there some deep vein of stress beneath the haphazard, rapid-speed lesson planning, essay correcting, test grading, syringe-confiscating, performance-giving normal day of teaching? This is what Google told me, and I found it quite humorous:

"A twitch sometimes develops during times of increased stress. Twitching has also been associated with high caffeine intake, fatigue or excessive squinting. It can also occur after reading or working on a computer for prolonged periods of time.
An eyelid twitch is usually a sign that you need to take a break and relax. Sometimes a twitch will go away following a good night's sleep, but a stubborn twitch may last as long as three weeks."

Three weeks?! What a strange conundrum! I don't consciously feel it, but my eye keeps saying "HEY! HEY! HEY!"... and I don't know why...