Bristol University scientists found that wake-up habits give 40 to 48 percent less chance of developing breast cancer. This number is approximately one case of cancer fewer than every 100 women who have a habit of getting up early.
The study also found an additional risk of breast cancer for women who sleep more than seven to eight hours per night. It is estimated to be equivalent to an additional 20 percent risk for each hour.
To produce this conclusion, researchers used information from nearly 400,000 women who had genetic information in the British Biobank. They are part of the Breast Cancer Association Consortium study.
By looking at about 450 sleep-affiliated genetic markers, such as the chronotype, the amount of sleep needed, and the risk of insomnia, scientists were able to study cancer risk independently. This study could see the risk of being released from confounding factors such as alcohol or smoking or known as the randomization technique.
