Sunlight can has positive and negative affects on health. While we’re frequently warned by healthcare advocates that too much sun exposure can lead to some forms of skin cancer, the benefits of moderate sun exposure are only just coming to light. These include increases in naturally produced vitamin D as well as the effect of sunlight on mood disorders such as seasonal affective disorder (SAD). In a time when everyone from the kid gamer to the student earning a PhD online to the average office worker is spending more hours indoors than in the past, understanding the health value of sunlight is crucial.