When I was in Iraq I was in charge of making the coffee (yes I realize it's insane that is an issue in a war zone) and I was filling a 32 oz cup about 3 times in a 12 hour shift. About 6 months into it we ran out of coffee.....Sacrilege. We didn't have any for about 3 days and that entire time I shook, had headaches, couldn't see clearly at night and had nightmares. When we got some again I didn't touch the stuff. Never went back.