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Top: Health: Mental_Health: Disorders: Mood: Depression: Seasonal_Affective

Seasonal Affective Disorder describes depression that varies with the amount of sunlight. With less sunlight, one may get depressed. To have SAD, this would occur every year, and the depression would be more than "winter blues."

During periods of greater sunlight, a degree of mania may occur, but that is not a prerequisite for this illness.

In rare cases, the symptoms are reversed, with depression occuring during periods of increased sunlight.

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