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Genes Dictate Whether You're a Morning or Night Person

New research confirms something I had suspected -- being a morning or night person is a genetic predisposition.

In the pre-modern world it would be advantageous for tribes to have a variety of chrontypes so that someone was awake/alert for threats at all hours of the day. However, as the article explains in the modern world a disproportionate share of rewards go to the morning person.