Longest I've stayed up is about 37 hours. I've only ever gone on two occasions I can recall without sleep. This New Years with a friend to make it memorable. We walked through the town at 7 on New Years Day, it was like something from I Am Legend. I conked at 5 that day.
The other day was when I was about 11, many moons ago. It was a great time, stayed at a friend's house, we didn't sleep, party next day, far too much caffeine for our young bodies managed to get us to the night, but when it wore off and I began to come down I was so tired the only way I can describe it is like being intensely drunk. Things register slow with your mind, you can't remember anything and carrying out basic tasks is suddenly alot of mental work.
I dunno why I just told that story. Moral is don't bother, it's pointless. Get the minimum amount of sleep required (9/8 hours) and you'll be fine. You'll be living most of your life awake and you won't suffer the bad effects of sleep deprivation.
Comments: I can feel it kicking in now, still havent eaten for a few hours and my eyes now feel heavy. I am warning very often now and losing focus. Got a can of red bull with my name on it but have to wait about another 3 hours until I can have it.
I could go down any second lads.