I'm an adult. I keep telling myself this to remind me that I have certain expectations of adult life. I have to sweep the floor, I have to feed the cat, I have to pay my water bill, etc. I also have to go to bed at a decent time and get up and go to work.
I do manage most of the time to get to bed by 8:00 or 8:30, at the latest on weekdays. On weekends I might stay up and then sleep in, but mostly I try to be pretty regular on the sleepytimes. I'm experiencing a new situation that's throwing that off, however.