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 Hello! These days in Hirosaki city, it snows almost every day.We rarely take solar light.So I would like to introduce about Seasonal Affective Disorder. Seasonal Affective Disorder is considered a mood disorder in which people who have normal mental health throughout most of the year experience depressive symptoms in the winter or summer. Symptoms of SAD consist of difficulty waking up in the morning, nausea, tendency to oversleep and over eat.It is thought that a cause is that the daylight hours shorten. Therefore when the sun appears, we go out as much as possible and must take light of the sun.