Women who wake up early may have a lower risk of developing breast cancer than the females sleeping for longer hours, a study has found.
Using a technique called Mendelian randomisation, researchers analysed genetic variants associated with three particular sleep traits — morning or evening preference (chronotype), sleep duration, and insomnia.
They analysed databases of more than four lakh women from two studies — UK Biobank study and Breast Cancer Association Consortium (BCAC) study.
In observational analysis of UK Biobank data, morning preference was associated with a slightly lower risk of breast cancer (one less woman per 100) than evening preference, whereas there was little evidence for an association with sleep duration and insomnia symptoms.
Mansa 