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

It’s not if it’s your normal schedule. Iv been on a going to bed at 5am schedule since 1999.