What's the longest you've gone...
...Without sleep?
For me, about 40 hours. This was years ago, and I worked overnights so as not to put my youngest in daycare. For reasons I can't remember now, my (now ex) husband was unwilling to take care of the kids one day so I ended up staying up all day instead of sleeping for a few hours after he got home from work. I had to work again that night, and didn't get to sleep until he got home from work the following day.
Needless to say, I was a bit of a zombie that second night of work. Coming home from work the next morning was the only time I've ever worried about falling asleep behind the wheel - not while moving, but at any red traffic light I hit I really had to force myself to keep my eyes open.