What's the longest you've gone without sleep?

The longest I've gone without sleep is 7 days. Ironically I had a bundle of energy and never felt tired. I went to the doctor about it and the first thing he asked if I was on drugs. I don't even smoke much less do drugs. It was just one of those things that the body does. That same day I went to bed and I did end up falling asleep and I slept very hard. It never happened again.