Winter brings seasonal affective disorder

A light box like the one shown here may help some people combat seasonal depression in winter.

Less sunshine in the winter can trigger symptoms of seasonal affective disorder, which strikes between 4% and 6% of the U.S. population and is more common in women in their 20s to 40s. Genetics may play a role in SAD, and for some, light therapy, psychotherapy or medication can help reduce symptoms. CNN