The most I've ever stayed up was 50 hours, give or take 30 mins here and there from falling asleep standing up, or sitting down for brief moments. I was unable to sleep due to nervousness. It was a crazy time in NNPTC, and I was studying for comp. It got to the point where as soon as I got to my friends, I fell to the floor, curled up under his bed, and went to sleep.