I remember after my last exams, summer last year, that I literally had so much coursework to do that I didn't start revising for all of them (which were in the same week too and 2 on the same day) until a week before hand. I was sitting at my desk for 16 hours a day just to get through the work. After those exams I had a massive crash... it took me about 2 days to recover before I could finally stay up long enough to go out!