my 5th year in college during finals. I had 4 in two days and stayed up for over 48 hours without sleep... i felt like I was tripping because I was hallucinating so badly from lack of sleep
i used to pull "all nighters" all the time, mainly because if i had something going on before 10am i would most likely miss it if i had to wake up... plus I am a HUGE procrastinator so i would try cram a whole semester of learning into a single night