As the days get shorter this time of year, some have difficulty maintaining a positive mood. One type of depression is known as Seasonal Affective Disorder (SAD). SAD typically sets in at the beginning of late fall and early winter and lasts through the beginning of spring and summer. Many often experience decreased mood from the fall through the winter, and then an elevated, more positive mood in the spring and summer. This type of depression usually effects individuals more as the days become shorter, meaning there’s less sunlight. Because SAD is a category of depression, the symptoms are the same. The thing that makes SAD a specific type of depression is the way the disorder matches with the changing seasons.
Some great forms of treatment exist to help those with symptoms of SAD. These treatments are outlined by the National Institute of Mental Health (NIMH). One example NIMH mentions is light therapy, which recommends individuals experiencing SAD sit in front of a light box for 20-60 minutes for extra exposure to light during the seasons with shorter days.
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References: National Institute of Mental health