..."Blood levels of the hormone melatonin, which may be abnormally high at certain times of day, are rapidly reduced by light exposure. Depending on when bright light is presented, the body’s internal clock - which controls daily rhythms of body temperature, hormone secretions, and sleep patterns - shifts ahead or is delayed when stimulated by light. These physiological time shifts may be the basis of the therapeutic response..."
http://www.sltbr.org/sadfaq.htm#b5
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