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Rotating nightshift work has been correlated with increased risks for numerous physical disorders including obesity, type 2 diabetes, and cardiovascular disease, leading to concerns that shift work might also contribute to the risk for cognitive decline. These researchers analyzed data on 16,190 nurses participating in the Nurses' Health Study, who at ages 58 to 68 reported the number of years in their careers during which they had participated in rotating shift work and who had cognitive data starting 7 years later (mean age, 74). Rotating shift work was defined as at least 3 nights per month in addition to day or evening shifts; exposure ranged from none to more than 30 years. Participants underwent three rounds of biannual cognitive test…