Holy shit I can barely function without one night of sleep. I don't even wanna imagine how much of a raging bitch I would be after....what did you say, 66 hours? Yeah. I'd either scream my head off at everyone or drown them in my tears.
Nah... I've been running on a heavy sleep debt all year due to a constantly changing work shedule (I've gone 1st to 3rd to 1st to 2nd to 3rd and will be going back to 2nd at Xmastime - but this time it will be permanent - never more than 2 months on a shift ).
My current record is somwhere around 40ish hours. I really REALLY wish I didn't have to sleep. Seriously. It may be enjoyable but it wastes so much time.
Just don't procrastinate that much. I procrastinate at school but the longest I've worked was from 6am to 3am. I then got 3 hours of sleep and got up and started again the next day. It was not too bad. You can do it. Plus, as long as you plan everything out, you should be fine.