Compromising sleep

I wake up and feel like shit, but even though I know I should sleep I can’t bring myself to give up having free time to unwind. When I go to bed, my free time ends. And I don’t want that, so I end up staying up longer than I should be. I was almost falling asleep on the ride home, and I was sleep-deprived tweaking while playing with friends. I really need to figure something out.