Vitamin D & The Immune System

            I found a very informative research paper ~   on the National Institute of Health,
            PubMed  website

                     Vitamin D and the Immune System

            Just in case the link above does not work:
            http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3166406/

            The article is protected by Copyright.    I can link to article.
            I can not pull quotes from article.   

            Vit. D  plays a far more important role in the Immune System  and in
            the treatment of autoimmune disease than originally believed.

            Being  Vit. D. deficient   ~    also interferes with Sleep.