Bright light boxes mimic natural light. We asked experts if they worked. Ask Well Bright light boxes mimic natural light. We asked experts if they worked. Credit...Eric Helgas for The New York Times ...

Feeling a bit down when the days become shorter is totally normal, but if your change in mood is more pronounced, it’s possible you have seasonal affective disorder — a mood disorder experienced by an ...

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 ...