Seasonal Affective Disorder SAD was first systematically reported and named in the early 1980s by Norman E. Rosenthal, M.D., and his associates at the National Institute of Mental Health. SAD is a type of depression that is commonly thought to be related to the amount of daylight a person is exposed to. For most people it tends to be worse in the fall or winter and can bring on an extreme form of the "winter blahs." Some suffers experience symptoms in the late spring or early summer; and others experience symptoms at every season change. The definitive cause is unknown light exposure is a fa
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