Night shifts may cause DNA damage: Study

Working night shifts can damage a person's DNA, increasing the risk of cancer as well as cardiovascular, metabolic, and neurodegenerative diseases, a study has found.

For the study published in the journal Anaesthesia, researchers analysed blood samples of 49 healthy full-time doctors taken at different times.

"Although this work is very preliminary, it is clear from the results that even a single night of sleep deprivation can trigger events that may contribute to the development of chronic disease," said Siu-Wai Choi, of the University of Hong Kong.

Researchers found that on-call doctors who were required to work overnight on-site had lower DNA repair gene expression and more DNA breaks than those who did not work overnight.

In these overnight on-site call doctors, DNA repair gene expression decreased and DNA breaks increased after sleep deprivation. Damaged DNA increased after only one night of sleep deprivation.

This DNA damage may help explain the increased risk for cancer and cardiovascular, metabolic, and neurodegenerative diseases associated with sleep deprivation, researchers said.