Dr. Michael Terman in Philly.com

George Brainard's fascination with this phenomenon, known as Seasonal Affective Disorder, or SAD, has taken him from Earth to space and back again. The Thomas Jefferson University neuroscientist's curiosity about the biological impact of light found connections between SAD Philadelphians, the circadian rhythms of astronauts, and sleep-wake cycles of concussion victims. NASA last month gave him an award for his role in designing new lighting for the International Space Station...
Read more at http://www.philly.com/philly/news/science/20150201_Jefferson_scientist_s_study_of_SAD_took_him_to_space_and_back.html#L1MtpZFCLGWYQQzh.99