I was a reasonable parent when raising my children. I saw no point in sending them to bed at 9pm. After all, if they need 8 hours of sleep a night, the last thing I want is them waking up early in the morning and disrupting MY morning time sleep. Because, if one gets 8 hours of sleep and goes to bed at 9pm, then 5am is their wake up time. That's nuts. Even if they sleep 10 hours a night, waking at 7am on a weekend or school breaks is too early if there is no good reason for them go get out of bed.
There were times that I was done parenting in a day and wanted time to spend with my spouse, without children around. Those were the times I sent my children to their rooms and they could stay awake as long as they did not disturb me. If they obeyed the rules, they got what they wanted and, as parents, we got what we wanted. It is all about compromise, in my opinion.