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

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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?

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Anonymous 0 Comments

Retired in my 60s I go to bed when I’m tired and wake up when I’m rested. My sleep fell into a cycle where it seems to shift an hour or two a day and I have a week or two of day cycle and a week or two of night cycle, and I’ve been perfectly happy with that. The only thing that throws me off is when someone wants to make plans with me a month or two in advance, because luck always puts it dead in the middle of my sleep. :/

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