Institute the following state mandated wake times and the bedtimes will just naturally sort themselves out:

10 am preteens
9.00 am teenagers
8.30 am 20 somethings
2.30 pm stoners
8.00 am 30 somethings
7.30 am 40 somethings
11.00 am gamers
7.00 am 50 somethings
4.00 am cats
6.30 am 60 somethings
6.00 am 70 somethings
5.30 am 80 or older
5.00 am no-one ever