Seasonal depression

By Metro Creative
According to a study published in the journal Progress in Neurology and Psychiatry, in a given year about 5% of the population of the United States experiences seasonal depression, a condition also known as seasonal affective disorder, or SAD.
A separate study published in the journal BMC Psychiatry in 2021 found that 12.7% of students attending higher education or vocational schools who responded to a survey showed SAD.
The organization Mental Health America notes that SAD is a subtype of depression or bipolar disorder that occurs and ends around the same time every year, typically beginning in fall and continuing into the winter.
Curiously, the study published in Progress in Neurology and Psychiatry found that the main age of onset of seasonal depression is between 20 and 30.
— Metro Creative