How did you feel after you pulled your first all nighter?

I’ve spent the last 6 hours working on quantum mechanics problems for my physics class, and I think sometime around 3:30 or 4 this morning I passed into the twilight zone. I’ve been in a state of what I think must be zen for the last several hours. I’m not tired, not stressed, not worried about anything, not apprehensive of anything. The only word that can really summarize my emotions right now is acceptance. This is very strange for me, since I am a complete control freak, and have a tendency to pull my hair out over the slightest incongruities. I’m just really relaxed.

What about you? Have you had similar experiences with staying up all night? Answer, or don’t. It’s all good.