Sleep medicine
Charles Czeisler , member of the Institute of Medicine and Director of the Harvard University Medical School Division of Sleep Medicine at Brigham and Women's Hospital , discovered that the leading cause ( 31% ) of fatal-to-the-driver heavy truck crashes is fatigue related , ( though rarely associated directly with sleep disorders , such as sleep apnea ) , with drugs and alcohol as the number two cause ( 29% ) . 
<triplet> Brigham and Women's Hospital <subj> Harvard University Medical School <obj> affiliation