Coach, which was executive-produced by Whoopi Goldberg, took the best short documentary prize while Italy's The Nightshift Belongs to the Stars won best narrative.
Meanwhile, another study carried out at Brigham and Women's Hospital in Boston, found only a "moderately increased risk" of breast cancer after extended periods of nightshift work.
"They said alright, you can take over your nightshift on Friday night and we'll alter the reliefs to go back onto their shifts on the Saturday morning, " he recalled.