I think the longest I've gone without sleep is forty-eight hours - I have very vivid memories of it, as I did it prior to going in for my Army physical. I'm pondering starting some short stories, and that event would certainly be an entertaining story I should think. I actually have ideas for about four stories that have been floating around my cranium for the last year, and since I'm in my crazy writing mode and I'm definitely not interested in beginning a new novel until next year, I may as well give these a go, and if I like them, maybe we'll have a new book of short stories next year. I do love the form.