I Have a Bedtime

Your body needs a diurnal sleep cycle (opposite of nocturnal) to have a healthy chemical balance, it's essential.

Sometimes people make their kids go to bed at 9 so that they'll actually be asleep by 10 (it takes time and electronics that have light shining in your eyes make it hard to sleep, you need melatonin in your system to sleep and your body releases it when it perceives a lack of light) but really as long as a person is asleep before 11 and gets at least 8 hours sleep they're fine, but accounting for trouble sleeping and anything that could disturb your sleep once or twice is a point of wisdom, and one reason that people set bedtimes for their kids until they feel like they're mature enough to manage their own sleep schedule and maintain it healthily

From a kid perspective I totally agree with you. My parents would put me to bed and I would lay there for hours sometimes until I was truly tired. But as a parent I always had reasonable bedtimes for my kids. High school age they can be trusted more as long as they get up on time and grades are good. No phones or computers in the bedroom at night though even though I would let them stay up later.

Yah I know this too well.
But I tend to behave like a refractory child if I don't get enough sleep

Well what time is your bedtime?