Worker Health and Wellness Research/studies Shift work

Study of night-shift workers links men’s sleep habits to cancer risk

Reprints
time-clock.jpg

Photo: EyeOfPaul/iStockphoto

Wuhan, China – Male night-shift workers who do not nap during the day or have worked the night shift for more than 20 years – as well as those who average more than 10 hours of sleep per night – may have a greater risk of developing cancer, according to a study from Huazhong University of Science and Technology.

Researchers reviewed data from approximately 27,000 men who had retired from the auto manufacturing industry, using a questionnaire to examine how working nights, napping during the day and extended sleep at night impacted the risk of cancer.

Results showed:

  • Men who worked the night shift for more than 20 years had a 27 percent higher risk of cancer.
  • Night-shift workers who did not take daytime naps had double the cancer risk of those who napped for up to 30 minutes.
  • Men who slept more than 10 hours per night had a 40 percent increase in cancer risk.

Additionally, men with at least two of the studied sleep habits had a 43 percent higher risk of cancer and a more than twofold increase in cancer mortality compared with those with who had none of the habits.

The study was published online Aug. 25 in the journal Annals of Medicine.

Post a comment to this article

Safety+Health welcomes comments that promote respectful dialogue. Please stay on topic. Comments that contain personal attacks, profanity or abusive language – or those aggressively promoting products or services – will be removed. We reserve the right to determine which comments violate our comment policy. (Anonymous comments are welcome; merely skip the “name” field in the comment box. An email address is required but will not be included with your comment.)