I can't believe no one has said this yet... If you run a couple miles during the day, about 2-3, you'll sleep like a baby at night and you will feel like you get so much more sleep from the few hours that you do actually get. What I mean by that is, if you get 4-5 hours of sleep now and feel like shit in the morning, if you run the day prior 4-5 hours will feel like 7-8 hours.