Insomnia can double prostate cancer risk

Insomnia can double the risk of prostate cancer in men, a study has shown.

The risk rises proportionately with the severity of sleep problems, researchers found, increasing from 1.6 to 2.1 times the usual level.

Why poor sleep can affect men’s chances of developing the disease is unexplained. But a previous link has been seen between insomnia and breast cancer in women.