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Definition of Winter Depression

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Updated February 19, 2014

Definition: Winter depression is a recurrent mood disorder associated with depression and excessive sleepiness during winter months. It is caused by a lack of bright light reaching the biological clock in a small region of the brain (the suprachiasmatic nucleus). Its treatment is the use of a light box to artificially extend the day length.
Also Known As: Seasonal affective disorder, SAD
Examples:
When she uses her light box each morning, she finds that her winter depression is better.
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