by Robert Tisserand
Feeling unusually sad is not uncommon in the winter months. Classic (winter based) seasonal affective disorder (SAD) is a mood disorder, affecting people with otherwise normal mental health. Symptoms include difficulty waking up in the morning, nausea, tendency to oversleep and overeat, cravings for carbohydrates, lack of energy, difficulty concentrating or completing tasks, withdrawal from friends, family and social activities and decreased sex drive. While sharing many symptoms with clinical depression, the main distinguishing factor of SAD is its seasonal character.