Seasonal affective disorder (SAD), which as its name implies, is a disorder related to the change in seasons. The earlier sunsets cause less daylight exposure which can impact mood and, subsequently, cause depression for many people. Further, SAD occurs like clockwork as the seasons change with certain people exhibiting the first warning signs in the fall which, consequently, worsen in the winter. During this time people with the disorder feel depressed, lethargic and irritable to the point that it interferes with their daily functioning.
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