Light therapy is effective in treating seasonal affective disorder because it

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Light therapy is effective in treating seasonal affective disorder because it suppresses the production of melatonin, a hormone that regulates sleep and wake cycles. People with seasonal affective disorder may produce too much melatonin, which can contribute to feelings of fatigue and depression during the winter months when daylight hours are shorter. By exposing individuals to bright, artificial light for a certain period of time each day, light therapy can help reset their circadian rhythms and reduce melatonin production.

Light Therapy Is Effective in Treating Seasonal Affective Disorder Because