Seasonal affective disorder (SAD) is a type of depression related to the changing seasons. It may occur in the winter, often called winter depression, or in the summer, called summer depression. However, most cases appear in the late fall or early winter. Signs of SAD include low energy, feelings of depression, sleeplessness, and feelings of hopelessness or changes in appetite or weight.While the specific cause of SAD is unknown, various factors can play a role. One includes your biological clock, the reduced amount of sunlight interrupts your body's internal clock, leading to feelings of depression. Also, reduced sunlight can cause a drop in serotonin that may trigger depression. Finally, the change in season can change the body’s level of melatonin, which plays a role in sleep and mood.
In order to combat SAD, there are a few actions you can take. One includes light therapy. Try sitting a few feet away from a special light box. Light therapy mimics outdoor light, which can cause a change in brain chemicals that are linked with mood. Other techniques to combat SAD include music, art therapy, and meditation or relaxation techniques. Before beginning any program, please speak with your primary care physician.
Reference: Mayo Clinic