Washington: A new study has found 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 study utilized data from two prospective cohort studies, the Health Professionals Follow-up Study (HPFS) and the Nurses` Health Study (NHS). A biennial questionnaire is sent to participants in each cohort to collect information on demographics, lifestyle factors and disease endpoints. Participants estimated their total hours of sleep in a 24-hour period and were asked if they snore.
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