"Understanding Seasonal Affective Disorder" is a short video from Toronto's prestigious Centre for Addiction and Mental Health (CAMH) treatment and research hospital. Dr. Robert Levitan, Research Head in CAMH’s Mood and Anxiety Disorders Program, discusses the disorder and its treatments.

As days grow shorter in late fall and early winter, the lack of sunlight leads to changes in the circadian system that can trigger SAD. More common in women than men (up to 80% of sufferers are female), symptoms range...
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