When I was in college, I had a roommate who would wait until Finals week to do his papers and studying. He'd do all-nighters the whole week. By Wednesday at 2:53 AM, I was ready to kill. Consequently, I was thrashed during Finals week too because I'm a light sleeper and broken sleep is as bad as no sleep at all.
My all-time record for consecutive hours awake in order to cram was 31 in 1995-96. Coffee and cold showers became my best friends.
Some of my best testing and basketball has been done when I've felt absolutely miserable. Gargamel rises to the occasion.