Seasonal Affective Disorder, is characterized as a mood disorder with seasonal patterns which begins in late fall and lasts until spring. Cravings for carbohydrates, weight gain, and excessive sleep are some characteristics of SAD. Although the etiology is unknown, there are some theories that suggest a decrease in the neurotransmitter, serotonin, may play a role. Other research is looking at the role of melatonin and phase disturbance with our circadian rhythm.

Because melatonin plays a role in regulating sleep and is actually produced in our brain during periods of darkness, research has examined the role of phototherapy – treatment that involves bright light – and the role of selective serotonin reuptake inhibitors (SSRIs) - one of the newer classes of antidepressant medication, in treating SAD.

For those who suffer from SAD, and would like further resources, the Center for Light Treatment and Biological Rhythms at the New York-Presbyterian Hospital, the university hospital of Columbia and Cornell, specializes in treating this disorder using chronotherapeutics – a way of resetting the circadian rhythm using timed light therapy. Another link that describes the diagnosing and treatment of SAD is the National Institutes of Health. Finally you can listen to this interesting report about different light therapy treatment at NPR.

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