Normally excercise will help, as rockzilla said. With that, when i have a
tough workout, i like to get about 8-9 hours of sleep, but usually get 6.5-7.5, more maybe on the weekend.
Other than a tough physical session, reading can get you dreary, sometimes watching mindless TV, whilst laying down, or especially sex, or just having a wank is good as well
Going against your body isn't too bad, but make sure you get some rest up on the weekends or days off, if possible. Small power naps are good as well, combined with another fuller session of sleep (like 5-6+ hours)