Seasonal Affective Disorder (SAD) is a subtype of depression marked by the onset of depressive symptoms that follow a seasonal pattern, commonly occurring in fall and winter. Reduced exposure to natural sunlight during these seasons is believed to disrupt circadian rhythms and neurotransmitter levels, contributing to the manifestation of symptoms. Individuals with SAD may experience low energy levels, mood disturbances (such as sadness or irritability), changes in sleep patterns (often characterized by oversleeping), difficulty concentrating, social withdrawal, and an increased appetite leading to weight gain.