Researchers have some good news about using sunlight or phototherapy to treat mood disorders such as seasonal affective disorder (SAD) and depression. In a mega study, Dr. Robert Golden found that bright artificial light has helped improve these conditions. Light therapy also has been tried in non-seasonal mood disorders, Alzheimer's disease, jet lag, insomnia, eating disorders and behavior problems. One approach uses "dawn simulation" to make the day longer like it is in summertime. Reseachers are not sure how the light therapy works, but this type of study continues.
I like the natural therapy approach when it is safe like this one is, and it has great potential to help a lot of people.