Seasonal Affective Disorder (SAD) is a type of depression that occurs at certain times of the year, usually in winter when sunlight is limited. Symptoms include low energy, sadness, oversleeping, and changes in appetite or weight. Reduced daylight affects serotonin and melatonin levels, influencing mood and sleep cycles. Treatment options include light therapy, psychotherapy, medication, and lifestyle changes like regular exercise and spending time outdoors. Recognizing early signs helps prevent worsening symptoms. Maintaining a consistent daily routine also improves stability. SAD is treatable with proper care and support.