Like an estimated 5 percent or so of Americans, I have seasonal affective disorder, better known by its all-too-appropriate acronym, SAD. Seasonal depression, which can entail lethargy and lower moods ...

Studies have found lower levels of serotonin, a brain chemical that helps regulate mood, in people with winter-pattern SAD. The light therapy you are asking about, known as bright light therapy, has ...

Seasonal affective disorder, or SAD, is a type of depression that's related to the changes in seasons. Symptoms typically appear in the fall, worsen through the winter months and eventually go away in ...