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> Sleep cycles exist and aren’t innate. Your engrained behavior or schedule is something that sets your cycle, but is changeable.

How do you know this? Not trying to be snarky, I'm just wondering if you have any evidence for this claim.

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This article (which I was reminded of by this thread) gives an overview of sleep for teenagers, and it isn't radically different for anyone else either:

https://www.nhs.uk/live-well/sleep-and-tiredness/why-are-tee...

I expect that there is variation within the general population with regards to body clocks.

This would still be consistent with there being genetic (or otherwise hard to change in adulthood) factors that make a person function better with a shifted sleep cycle. It's not at all clear that it's all environmental (like the post I replied seemed to imply) and I find it irritating when people make such sweeping claims without evidence.

That's an entirely reasonable thing to be irritated at.

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