Seasonal affective disorder (SAD), or seasonal depression, is more than just the typical "winter blues." While it's most common in the darker winter months, it can strike anytime throughout the year.

Though they were developed for depression, some types of antidepressants can treat SAD effectively. The most commonly prescribed antidepressants for SAD are: Selective serotonin reuptake ...

But about 11 million Americans have a more severe form of winter depression-- seasonal affective disorder, the aptly acronymed SAD that is typically diagnosed after at least two consecutive years ...