Went without sleep for about 4 days. Of course, I kidded myself into thinking I would spend all that time studying and I didn't. I could have easily gotten a few hours every day. On the last day, a bunch of us were at breakfast in the cafe, which faced the rec center across the street. I pointed out the four people who were over there playing pool and asked how in the world anyone could have time to play pool during finals week, and was informed that there was no one there. Sadly, I was hallucinating.
That was the last time I stayed up that long during finals, and managed my time much better in the remaining semesters.