How to become a morning person: Light disrupts regular sleep cycles, study finds.
A Week in the Woods Can Remake You Into a Morning Person (VIDEO)
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Aug. 7 2013 11:59 AM

A Week in the Woods Can Remake You Into a Morning Person (VIDEO)

Our sleep cycle, or circadian rhythm, is based on the body's reaction to the daily rise and setting of the sun, producing more of the sleep-encouraging hormone melatonin in the dark hours and less after dawn.

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