Do you find that you're most alert after everyone else has turned in for the night? Or are you the type to hit the deserted streets for a run at 5:30 am? While all humans are essentially programmed to sleep at night and be active during the day, some people have a marked morning or evening preference. "There's really a spectrum from morningness to eveningness," says Jamie Zeitzer, PhD, a fellow in the Sleep Research Center at Stanford University in California. "Most people fall in the middle, but there are people who are on each extreme.

Original Article: Are You an Owl or a Lark?

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