That's not necessarily true - it's age dependent. Adolescents/teenagers are "hardwired" to stay up later[1] and sleep in later (relative to adults or younger children).

1 - https://www.nationwidechildrens.org/specialties/sleep-disord...

Yep, my bedtime was 8pm growing up, until middle school, then it was 9pm. 15-16 was when I stopped having a bedtime. I absolutely hated it at the time, especially in the summer because it would still be light out when I went to bed, and I never felt like I never ever felt like tired or like I needed to go to sleep at "bedtime".

In retrospect I'm glad I always had a full night's sleep, because I wouldn't have if left to my own devices.

Nowadays parents keep their kids up all hours of the night, I really don't get it. I see elementary aged kids out and about (in public) 9, 10, even 11pm.

This is an overly simplistic take. Everyone has different natural circadian rhythms and not everyone is tired enough to fall asleep at 8pm.

Sure if humans where robots that have an push to sleep button directly when you get to bed.

My children all go to bed at 8:30 PM and only one of them naturally wakes up before 7AM.

Then they're home at 4pm and get a whole 4 hours for homework, recreational activities and relaxing.