Treatments include light therapy, medication, ionized-air administration, cognitive-behavioral therapy, and taking the hormone melatonin at the right time. Doctors often cure SAD with bright light therapy, although normal light therapy is the most common treatment for SAD. Part of light therapy can include being in sunlight, either directly from being outside, or by using a computer controlled heliostat (a device that includes a mirror, usually a plain mirror, usually turns to keep reflecting sunlight on a specific object) to reflect into the windows of a home or office. Physical exercise is also a good form of therapy for SAD, especially when combined with other forms of treatments.