ELI5 Morning People - What makes someone a morning person?

What makes someone a morning person? How do you explain the Circadian clock? If I'm not one, is it possible to become a morning person?

... We explain like i'm five!

Thank you to the r/explainlikeimfive community, and specifically the following reddit users whose questions and responses formed the basis of this conversation: brylow, slingbladerunner, cjc09, auroun2013 & hansfredderik

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