Falkenbach, Dr. A., et al. "Heart Rate Fitness Variability" Biological Effects of Light. New York, Walter de Gruyter, 1992.

Beat the "Winter Blues"
70% of patients with Seasonal Affective Disorder (SAD) show improvement after UV treatment, the only known cure for the "winter blues".

Wirz-Justice, A., et al. "Light Therapy in Seasonal Affective Disorder is Dependent on Time of Day or Circadian Phase" Arch Gen Psychiatry. 50:929, 1993.

Increase your Metabolism
Sunlight stimulates the thyroid gland, which boosts your metabolism.

Hollwich, Fritz, The influence of Ocular Light Perception on Metabolism in Man and in Animal. New York: Springer Verlag, 1979.

Minimize your Risk of Osteoporosis
Because UV exposure produces Vitamin D which helps in the absorption of calcium into bones, you could decrease your risk of developing osteoporosis.

"Interim Report and Recommendations for Osteoporosis", World Health Organization's Task Force for Osteoporosis, November 4, 1999.