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Seasonal Affective Disorder, also known as SAD, winter blues, or seasonal depression, is a medical condition caused by the seasonal change in the amount of available sunlight. SAD (which affects as much as 10% of the population) is most pronounced in the more northern regions of the world, with a greater daylight variance from summer to winter. Women are affected to a larger degree than men (by almost 3 to 1). Symptoms vary depending on the severity of the individual case. In its milder form, “winter blues”, symptoms include a lack of energy, depression, listlessness, and food cravings for sweets and carbohydrates. By contrast, cases of the more debilitating Seasonal Affective Disorder may include additional symptoms: Problems sleeping, change in appetite or weight, loss of memory, lack of concentration, severe depression and confusion

Verilux is the leader in treatment of Seasonal Affective Disorder and the winter blues.