my guess is something you ate. some foods just have that effect on people; for my wife it's purple peruvian corn drink (no, really (http://www.amazon.com/Purple-Corn-Drink-Chicha-Natural/dp/B000O98YIC)) -- it's supposed to be really good for you (http://www.beonliving.com/index.php/health/article/164-what-is-purple-corn) but if she drinks even a mouthful, it's time for some coffee and a lie-down for the rest of the day.