Women who begin their day early are likely to have a lower of risk breast cancer, than late beginners, suggests a research.
The study found that a preference for mornings reduced the risk of breast cancer by 40 per cent compared with being an evening type.
It also found that women who slept longer than the recommended seven to eight hours had a 20 per cent increased risk of the disease per additional hour slept.
"The findings of a protective effect of morning preference on breast cancer risk in this study are consistent with previous research highlighting a role for night shift work and exposure to 'light-at-night' as risk factors for breast cancer," said Rebecca Richmond, a research student in the Cancer Research UK.
"We know already that night shift work is associated with worse mental and physical health. This study provides further evidence to suggest disrupted sleep patterns may have a role in cancer development," she added