I typically sleep when I can. As a locomotive engineer I'm on call thursday to monday 24 hrs a day. This means I may work all night and then work all day. It's a federal law now that they have to give us 10 hours off between runs, but you should try to sleep when you aren't tired or are amped up...only to know that you are going back to work in 10 hours. I'm actually considering finding another job, it's just that a good one is few and far between...