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What difference does it make ? It's just a mindset.

It's a mindset or preference to the same degree that homosexuality is: https://en.wikipedia.org/wiki/Chronotype

Whoa, I didn't know that was a thing. Now I've got a handy little reference available when the girlfriend complains that I "stay up too late" (past 10pm!).

Circadian rhythms aren't mindsets.

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