Causes
Seasonal depression, or seasonal affective disorder (SAD), is caused by a decrease in light in the winter months. SAD can also occur in the summer that manifests as hypomania due to the increase in light.
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During the holiday season, are you humming “Holly Jolly Christmas” or is “Blue Christmas” the song that keeps running through your head? Maybe it's “I'll Be Home for Christmas,” with its wistful longing. Are you surprised that you don't feel as joyous and celebratory as you usually do, or as you feel you should?…
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