haha once, i had to go into work one day, while i was still in school, problem is i still went out drinking the night before and prolly got home some ridiculous A.M. hour and had to get up at 6 to go write an exam.  so i got up and lately when i drink too much and don't sleep and eat it off i get mad vertigo, i sweat, it's disgusting and i feel like i'm dying, worst hangovers ever, so i had to call my boss and say that i just got the flu and i couldn't stop throwing up at school. which i hadn't thrown up, but yeah, pretty fucked.
hasn't happened recently but i don't take rest for granted anymore...