There is a great deal of information on SAD around the web and many studies have been made with the link of lack of sunlight and mental, physical and emotional conditions. We do know that lack of light affects the spiritual conditions in each of us as we are a source of light ourselves.
There may be many other issues linked with the lack of light and our world of artificial light which produces too much ‘blue light’ and not a more even full spectrum light which is constantly exposed to our eyes, brain and body.
Here are just some articles from the medical profession supporting this evidence:
1.Melatonin and circadian biology in human cardiovascular disease
2.Obesity and Metabolic Syndrome
3.Blue light has a dark side – Harvard Medical School
4.Exposure to blue light before bedtime – The Endocrine Society
A whole host of articles have been written on this area, some of these you can find by click on this link. We will constantly add with new articles and revisions.