8 more hours to go

I'm on night duty on labor and delivery this week. This is my second night, and although it is cool (I've gotten to deliver a couple of babies), it is pretty damn tiring. I'm actually pretty good at staying up at strange hours and can handle being on call overnight every once in a while, but working nights day after day is not easy to get used to. I'm a med student and don't have nearly as much running around as the residents do. How do they do it? It just seems really dangerous to have overworked and sleep deprived people dealing with emergencies. I guess they get used to it (or learn to sleep during the day better than I can). 5 hours down, about 8 1/2 to go.