ELI5, why is going to bed super late bad for you if you still get the same amount of sleep?

Question

I’ve always wondered this, espeically over summer break or for those who work later but why is going to bed late bad for you if you still get the perfect amount of sleep?

For example, last night I wen’t to bed at like 1:30 AM and woke up at 10:30 am, which is 9 hours? So if I’m getting required sleep, how is it bad for me?

In: 2565

Answer 1

I’ve heard from an anthropological perspective that it can be beneficial for communities to have both “day” and “night” people so that there is always someone on guard. As others have said, it’s not about when you get the rest it’s that you get the right amount.