Way back in my student days I once spent 4 weeks playing the original Populous (on the Amiga) with a couple of hours sleep a night and minimal sustenance. At the end of the 4 week Easter break, I got on the ferry to go back to University and all the waves were grid based, I could raise them and lower them just by raising my hand, and I felt very godlike.

The wonders of sleep deprivation. I recommend it to anyone