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Nature Journal: Casting Light on Sleep Deficiency

Article in Nature Journal by Charles A. Czeisler, chief of sleep medicine at Brigham and Women’s Hospital and director of sleep medicine at Harvard Medical School:

The use of electric lights and devices at night is distrupting the sleep of more and more people.

http://www.nature.com/nature/journal/v497/n7450_supp/full/497S13a.html