MiniSun compact portable SAD light. Simulates natural daylight to alleviate symptoms of Seasonal Affective Disorder (SAD). Up to 17% of people experience these symptoms which are caused by a lack of daylight. These can include lack of energy, difficulty sleeping, over-eating and increased anxiety. Using the MiniSun Compact SAD Light for just 60 minutes a day can give you a boost & help to combat the symptoms of SAD.