January 4, 2008, Newsletter Issue #122: About Circadian Rhythms

Tip of the Week

Circadian rhythms are physiological changes that occur on a 24-hour cycle and are influenced by environmental factors. The day-night light cycle has an especially strong influence on the body's circadian rhythms. When circadian rhythms get thrown off, say, during the winter when daylight is limited, can include everything from clinical depression to persistent sleep disruption and insomnia.

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