Final answer:
Light therapy, or phototherapy, is used to treat Seasonal Affective Disorder (SAD), a type of depression that occurs during the winter months. Exposure to bright light helps regulate circadian rhythms and increase serotonin levels, improving mood in individuals with SAD.
Step-by-step explanation:
Light therapy, also known as phototherapy, is a treatment option for a specific type of depression called Seasonal Affective Disorder (SAD). SAD is a mood disorder that typically occurs during the winter months when there is less natural sunlight. It is characterized by symptoms such as increased appetite, sluggishness, and increased sleepiness. Light therapy involves exposure to bright light, usually from a special lamp, in order to mimic natural sunlight. The light helps regulate circadian rhythms and boosts serotonin levels, which can improve mood in people with SAD.