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A new study is the first to report a significant positive association between long sleep duration and the development of colorectal cancer, especially among individuals who are overweight or snore regularly. The results raise the possibility that obstructive sleep apnea may contribute to cancer risk. “Our current study adds to the very limited literature regarding the relationship between sleep duration and/or sleep quality and colorectal cancer risk,” said lead author Xuehong Zhang, MD, ScD, instructor in the Department of Medicine at Harvard Medical School and associate epidemiologist at Brigham and Women’s Hospital in Boston. “The novel observation of increased risk among regular snorers who sleep long raises the possibility that sleep apnea and its attendant intermittent hypoxemia may contribute to cancer risk.”
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