I've been randomly up 24 hours, but not lately. When in army during some camps, we sometimes spent a week with <i>some</i> sleep everynight ( like 1 - 4 hours), but kept going on like that all week and it sucked. It was usually worse when some people were "sick", hence they couldn't make it to camp and there was less of us to keep fire and guard in our tent ( there always had to be someone keeping the fire up in tent and one guarding the area somewhere out :.:\