Excellent Overview of S.A.D. from Psychology Today
https://www.psychologytoday.com/blog/sleep-and-be-well/201301/sad-tale
S.A.D. Light Treatment Article from the Mayo Clinic
http://www.mayoclinic.org/tests-procedures/light-therapy/basics/definition/PRC-20009617?p=1
Choosing a Light Box Article from the Mayo Clinic
http://www.mayoclinic.org/diseases-conditions/seasonal-affective-disorder/in-depth/seasonal-affective-disorder-treatment/ART-20048298?p=1
Terrific In-depth S.A.D. Overview & Light Therapy Article written in "understandable" language.
http://psycheducation.org/treatment/bipolar-disorder-light-and-darkness/light-therapies-for-depression/
