I would definitely say so. Personally, I’d just not have one. Let them face the consequences of lack of sleep so they know how important it is. I think it’s weird that sleep schedules are never emphasized to teenagers. Probably a lot less sleep deprived teens if they were encouraged to get all the fun done before night hits and then easing into sleepy time.

But not having a set time could also backfire and they end up like I did with only sleeping like 4 hours but getting naps in whenever possible at school. Always surprises me how good the human body is at adapting.