Anika, you are always so helpful and full of great advice. I just read some reports on light therapy in treating winter depression (aptly named SAD- seasonal affective disorder). In the journal articles I was reading, its been given rave reviews! For those who would like to receive the benefits without the expense of in-office treatments or purchasing their own lamp, the articles suggested taking advantage of any day when there is natural sunlight outside. According to the article, it only takes 15 min of exposure daily to get the full benefit of the sun's vitamin D. It also suggested adding vit D to your diet to supplement cloudy days.