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For those unaware Seasonal Affective Disorder is a type of depression. It happens during certain seasons of the year—most often fall or winter. It is thought that shorter days and less daylight may trigger a chemical change in the brain leading to symptoms of depression.

Melatonin, a sleep-related hormone, also has been linked to SAD. The body naturally makes more melatonin when it's dark. So, when the days are shorter and darker, more melatonin is made.

There are two types of SAD:

Fall-onset. This is also called "winter depression." Symptoms of depression begin in the late fall to early winter months and ease during the summer months.

Spring-onset. This is also called "summer depression." Symptoms of depression begin in late spring to early summer. This type is much less common.

Symptoms listed here for more info: https://www.hopkinsmedicine.org/health/conditions-and-diseases/seasonal-affective-disorder#:~:text=Key%20points%20about%20SAD,seasonal%20affective%20disorder%20(SAD).