" Risk factors
Seasonal affective disorder is diagnosed more often in women than in men. And SAD occurs more frequently in younger adults than in older adults.
Factors that may increase your risk of seasonal affective disorder include:
Family history. People with SAD may be more likely to have blood relatives with SADor another form of depression.
Having major depression or bipolar disorder. Symptoms of depression may worsen seasonally if you have one of these conditions.
Living far from the equator. SAD appears to be more common among people who live far north or south of the equator. This may be due to decreased sunlight during the winter and longer days during the summer months.
Low level of vitamin D. Some vitamin D is produced in the skin when it's exposed to sunlight. Vitamin D can help to boost serotonin activity. Less sunlight and not getting enough vitamin D from foods and other sources may result in low levels of vitamin D in the body."
Is it possible that it has more to do with inadequate nutrition, lack of D, lack of SEEING light of appropriate spectrum, lack of physical activity, feeling cold, etc?
I personally noticed that being in much brighter (higher lumen and higher color temperature) artificial lighting, for longer period of time at home makes me more... alive?