All nighters have not been fun for me when flying. It's happened a few times, usually when I have an early flight and I get so anxious about waking up early that i don't fall asleep.

The lack of sleep just puts me into survival mode, especially since the whole process of getting to and through the airport requires full attention. By the time I get to my seat, I'm too paranoid, irritable, and nervous to relax. My eyes are usually blood shot and I excrete tons of body oil and sweat. I'm usually only able to fall asleep for seconds or minutes at a time before jolting awake from the misplaced (yet unavoidable) anxiety that I should be more alert.