Light therapy is the use of natural or artificial light to treat various ailments, but primarily depressive and sleep disorders. It may be administered by a physician, physical therapist, psychiatrist, or psychologist–or done on one’s own with proper instruction from a trained professional. While exposure to the full-spectrum wavelength of natural sunlight is considered the best form of light therapy, it is not always possible for many people to get outdoors. Therefore, light therapists often recommend treatment with simulated sunlight from light boxes.
The wintertime blues, also known as Seasonal Affective Disorder (SAD), usually begin when the days get shorter and the sky clouds over into perpetual gray. Many people with SAD dread late autumn because the clocks move back an hour and, in a single day, autumn twilight becomes dark night.