What's the longest you've stayed awake, and why?
For me, it was the release of the World of Warcraft: Mists of Pandaria expansion.
I was up for 30 hours before my body couldn't handle any more of it and shut down. I thought I could get by with a power nap, but when I got out of bed, my body had the shakes and didn't want to focus on anything. It was the weirdest experience, and most ridiculous reason for staying up so late.
I took a week off work, and got 2 characters from 85-90 in less than 48 hours. The slowest part about leveling was having to level with a partner. We started with 5 in the group, but it quickly dropped to 3 then 2 when people couldn't keep up with the quest objectives fast enough. It sucks to have to do a drop quest as well without shared quest drops (only one person can loot the item needed).