What is the condition known as SAD?
SAD is an acronym for Seasonal Affective Disorder, a form of depression. Scientists have found evidence that many people require greater exposure to light in order to function normally. Melatonin helps induce sleep at night, but if generated during daytime hours can produce feelings of depression. Bright light, like summer sunlight at midday, causes the body to suppress the release of melatonin. Exposure to additional light can make people feel more alert and alive, leading to a greater sense of alertness, well-being, and enjoyment. Light sources that emit only visible light are often used to treat Seasonal Affective Disorder (SAD) and Sub-syndrome Seasonal Affective Disorder (SSAD).
