Seasonal affective disorder (SAD) is characterized by

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Seasonal affective disorder (SAD) is a type of depression that is related to changes in seasons. It usually begins in the fall and continues through winter when there is less sunlight and the days are shorter. The exact cause is not known, but decreased exposure to sunlight seems to be a factor in triggering SAD. This suggests that depression is linked to the body's production of melatonin, which is produced in the absence of light and helps regulate sleep.

Seasonal Affective Disorder (SAD) Is Characterized by