If the "winter blues" or "cabin fever" is really getting you down, and you just can't seem to shake those doldrums, you may be suffering from seasonal affective disorder (S.A.D.) Perhaps you have never thought of S.A.D. as a sleep disorder. In the strictest sense, it's not. It's a form of depression.
However, major symptoms of S.A.D. include increased need for sleep and extreme fatigue. It is listed in many places as a sleep disorder, right along with jet lag and the sleep problems caused by...

