I think the worse period for me was after exams. I would feel quite anxious the weeks before, usually procrastinate to no end, and then think "wait will it's all over ... ahh". When it was all over, that walk from the pub back to your room and there are books and papers flung all over the place.
You have to move all of it off your bed so you can lie in it -- and I always felt kinda empty, apathetic. No great joy or excitement, just your "life" for the past 3 months over and you don't know what to do you with yourself. Normally 3-hour nap and return to the pub again until the overdraft is gone.