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That's not what the medical research suggests. You can "force" yourself to follow a different schedule, but your natural chronotype is biologically-determined, so you will never truly adapt.

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Do you have a source for this? I'd love to read it!

I don't, sorry, maybe try Google?

This seems good: http://www.huffingtonpost.com/dr-michael-j-breus/night-owl-s...

That's so interesting. I have most definitely flipped from night to morning over the years. Work may have had some steadying influence on that.

Actually, that (EDIT: "an earlier chronotype shift" to be clear) is a normal part of aging.

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