It’s a type of depression that returns at the same time every year, usually in late fall or early winter, when there is less sunlight as the days get shorter. Some people get it in spring or early summer, but that’s not as common.
You could feel tired, sluggish, and in low spirits for much of the day. It can sometimes last for weeks at a time. You might find it hard to sleep, concentrate, or enjoy your favorite activities. It’s possible you’ll overeat and gain weight as well.
