National Geographic News, Reporting Your World Daily

Sunday, November 22, 2009

Photo: Early Birds, Night Owls: Blame Your Genes


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Mornings can be hard for night owls—and the "alarm clocks" in our skin cells might be part of the reason, a new study says.

Researchers found that preferences for when people wake and go to sleep is encoded in their genes and the molecules of skin cells.

Photograph by Jason Homa/Getty Images