1.What Are the Symptoms?
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.
2.What Causes SAD?
Doctors think less sunlight at certain times of year can trigger your body to change the way it makes and uses certain key brain chemicals. It may be that fewer daylight hours raises levels of melatonin and lowers levels of serotonin, two substances that help keep your sleep regular and your mood even.
