Understand your body’s chemistry
Circadian rhythms are influenced by your environment. This includes light exposure, which adjusts your body clock and suppresses the release of melatonin, a natural hormone that signals to your body that it’s time to sleep, according to Charles Czeisler, director of the division of sleep medicine at Harvard Medical School. That’s one reason people find it easier to get up in the summer, when the sun rises earlier, he explains.
from Reader's Digest http://ift.tt/2k2tD6K
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