... cycle can also occur if you are exposed to unnatural light (such as computer screens) late at night. A lack of vitamin D has also been linked to the symptoms of SAD, and plays a vital role in hormone regulation. Vitamin D is naturally produced in ...
http://www.walesonline.co.uk/news/health/how-beat-winter-blues-6249689
http://www.walesonline.co.uk/news/health/how-beat-winter-blues-6249689
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