Seasonal affective disorder (SAD) is a type of depression that occurs at specific times of the year, typically in the fall and winter months when daylight hours are shorter. This condition is thought to be linked to changes in light exposure, which can disrupt circadian rhythms and influence mood-regulating neurotransmitters in the brain. People with SAD may experience symptoms such as fatigue, changes in sleep patterns, and a general lack of interest in daily activities.
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