Women whose work requires them to work nights are at increased risk for ovarian cancer according to a large case-control study. If they reported ever having worked nights their risk of invasive epithelial cell ovarian cancer increased by almost 25%. These risks were limited to women over 50 years old. Shift work disrupts circadian rhythms and may act as a "carcinogen" through influences on melatonin and reproductive hormones.
PositiveTip: Getting regular sleep may have larger benefits than simply providing rest and recuperation.