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Seasonal affective disorder and why light therapy helps

Seasonal affective disorder, or SAD, is a type of depression that affects people in the Northern Hemispere during the winter months.

In this CBC article, Dr. Robert Levitan, a Professor of Psychiatry at the Mood and Anxiety Disorders Clinic at the Centre for Addiction and Mental Health (CAMH) explains why some people experience SAD, and why and how light therapy helps to alleviate symptoms.

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