I can't speak for you, but I find that working crazy hours is a big waste of time in the long run. My health, happiness and mental soundness all deteriorate due to a screwed up sleep schedule and lack of socialization. Aside from the long-term consequences to body and mind, all this deterioration adversely affects the quality of my work. I spend a lot more time chasing dead ends when my life is out of whack. So take a break, have a drink with friends, maybe even get laid. Your project will thank you later.