MEN who sleep for over 10 hours per night on average, who have worked night shifts for over 20 years, or work night shifts without daytime napping, may have an increased risk of cancer, as indicated by a study published in the Annals of Medicine.
The study completed by the Huazhong University of Science and Technology in Wuhan, China, gathered data from interviews with middle-aged and older Chinese in the Dongfeng-Tongji Cohort Study, a group of around 27,000 resigned workers from the Dongfeng Motor Corporation.
The researchers were examining the effects three rest sleep habits on cancer incidence: Night shift work, daytime napping, and nighttime sleep.
The authors report that men who had worked night shifts for over 20 years had a 27 percent increased risk of cancer incidence and that men that did not sleep in the daytime had double the risk of cancer of those who frequently took a 30-minute rest.
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They also found that men who slept for over ten hours for every night had an increased risk of cancer. In any case, no such relationship was seen in women.
The researchers also found that male participants with at least two of these rest habits had a 43 percent increased risk of cancer incidence and a two-fold increase in cancer mortality, contrasted with the individuals who showed none of the sleep habits.
The researchers noted, in any case, that the age of the study participants, self-reported lifestyle data, and a short follow-up period to their study may limit their conclusions, and that a long-term study would be expected to verify their findings.