Why do humans need a good balance of light and dark to stay healthy?
Question:
Answers:
At least 3 reasons. One is S.A.D. or Seasonal Affective Disorder and the other is Vitamin D.
S.A.D.
http://en.wikipedia.org/wiki/Seasonal_affective_disorder
The Sun and Vitamin D
http://www.healingtherapies.info/Sunlight&VitaminD.htm
Plus you need the night so you can sleep, of course.
http://www.getsomesleep.com/sleepAndHealth/sleep-3.html
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