What time do you think little children go to bed?
Black out curtains really help. But starting the bedtime routine when the sun is out is a real chore. I honestly have no idea how Alaskans get their kids to sleep at all in the summer.
The other thing that helps is consistency and bedtime rituals, that being said I'm glad that as school starts the nights are already noticably longer and we'll soon be able to watch the sunset and be in bed on time
It's about setting firm rules and sticking to them.
I don't think there are many one-size-fits-all answers when it comes to kids.
I work on the basis that younger children do better with about 10-11 hours sleep