One type of depression in depression is characterized by seasonal and recurrent episodes, called seasonal depression. Patients with seasonal depression are more sensitive than normal to seasonal changes in their environment, often experiencing depressive episodes in the fall and winter (early October to late November) that resolve in the following spring and summer (mid-February to mid-April). The winter type is more common than the summer type, and its occurrence is often associated with a seasonal decrease in light exposure, which later remits with a seasonal increase in light hours. Compared to non-seasonal depression, patients with seasonal depression have less impairment in occupational and cognitive functioning because they are less likely to receive psychotherapeutic and pharmacotherapeutic interventions.