Got cabin fever?Are the cold temperatures, overcast skies and perpetual morning dew taking their toll on your overall psyche?You’re not alone. Seasonal affective disorder – known more commonly as “the winter blahs” – is common among people who are active during the summer months and suddenly find themselves confined to their homes for a long period of time. The absence of sunlight and the chemical processes that it spurs in the brain, experts say, is to blame.