SAD 27, or Seasonal Affective Disorder 27, is a type of depression that occurs at specific times of the year, often during the fall and winter months when daylight hours are shorter. It is characterized by symptoms such as low energy, changes in sleep patterns, and feelings of sadness or hopelessness. The condition is believed to be linked to changes in light exposure, which can affect the body's internal clock and levels of certain neurotransmitters. Treatment options for SAD 27 include light therapy, which involves exposure to bright artificial light, as well as psychotherapy and medication. Many individuals find relief by spending more time outdoors during daylight hours or using light boxes designed to mimic natural sunlight. Understanding and addressing SAD 27 can significantly improve the quality of life for those affected.