Seasonal affective disorder is a condition where depressions in fall and winter alternate with nondepressed periods in the spring and summer. The Degree to which seasonal changes affect mood, energy, sleep, appetite, food preference, or the wish to socialize with other people has been called "seasonality." The author reviews historical aspects, clinical features, epidemiology, genetics, pathophysiology, and treatment of seasonal affective disorder and seasonality. Better understanding of the contemporary concept of seasonal affective disorder, seasonality, and light treatment will improve patient care and promote scientific advances in behavioral sciences.
Sher, Leo M.D.
"Seasonal Affective Disorder and Seasonality: A Review,"
Jefferson Journal of Psychiatry:
1, Article 2.
Available at: http://jdc.jefferson.edu/jeffjpsychiatry/vol15/iss1/2