I stayed up nearly all night doing a piece of coursework once, needless to say I failed, staying up all night is a bad move, you'll only be exhausted for your exams tomorrow, and you won't think so well, go to bed, just close your eyes and you'll feel tired soon, failing that, travel sickness pills help get you to sleep, you might have difficulty waking up again, but you should be fine otherwise,, and you feel fresh and ready for your exams. Crammings all well and good but if you haven't learnt what you need to by now, you won't do it in an all nighter