I'm 25, but I wish my parents would come over to my house and enforce a bed time.
I work Mon-Fri, and on a weeknight, I'm never in bed before 11, but usually going to bed around midnight. Sucks considering my alarm goes off at 5.
The weekends it just doesn't matter. Last night I passed out around 2, the weekend before I was up Fri and Sat night until at least sunrise.