I'm sure chaperons to grad night can tell everyone what it is like to ride Pirates at 4 am or any other ride during the wee hours of the night. I never signed up because although I am a big Disney nut, I value my sleep and being around all those teenagers (especially after spending a whole year with them) wasn't that appealing.
We were there during Christmas this year and I had a hard time keeping my eyes open while walking around the countries at Epcot. It is so darn dark.
Well, I'm sure there will be lots of young folks interested in staying up all night at Disney.