I've never been able to stay up for 24 hours in a row. And it's certainly not for lack of trying either. Hell, I couldn't even stay awake for 24 hours at either my junior or senior prom. I also stumbled across an old journal of mine from 1992 where I was on spring break and was staying up all night and sleeping a good chunk of the day. Well, one day my goal was to stay up till 11:06 AM so that I could say that I was up for 24 hours. I didn't make it. I think I ended up going to bed around 9 AM, just two hours shy of the mark.