No sleep is kind of my thing. Cricket matches usually start at 12:00 midnight for me, or around 4 AM or so. I'll watch the game, leave for school at 7, come home and study and do shiz till 12 and do it again. I've gone around 53 hours i'm guessing at some point during the Australia series last year.
I also seem to work best during the hours of 2AM - 6AM. I have a bad habit of putting off massive month long projects, i'm talking 25 page scientific papers which are worth 30% of your grade, till the last night. I started at 10PM the night before its due and worked literally all night and was done at 7AM. Got a 98% on the thing, was mighty pleased :cool:.
I've pulled countless allnighters, be it for cricket, studying or just mucking around. I usually feel fine during the day but at specific intervals (Usually after 27 hours or so) the tiredness hits like a brick wall for an hour or so. EVERYTHING seems funny, I laugh like a maniac for the stupidest things and I probably look mentally challenged after crossing 30 hours or so.