I'm very serious when I say that it is a diagnosed condition called Seasonal Affected Disorder. It can go from the mild, which most of us have experienced at some point , to the very severe, i.e. deep depression, etc. Most believe it is caused by a lack of vitamins from a lack of exposure to the sun. A friend of mine had it to the point that he needed to spend time in front of a light box throughout the winter so he could make it through.
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