Sleep can significantly change the hormonal balance of the body, which, in turn, affects the growth of malignant tumors. The study found that for women with breast cancer is characterized by a change in the cycle of cortisol - a hormone that regulates immune responses, including the activity of cells that help the body fight cancer, according to an Internet publication for girls and women from 14 to 35 years Pannochka. net In the normal state, the highest level of cortisol falls during the dawn and gradually decreases throughout the day. The rhythm of cortisone, disturbed by a bad sleep, makes a person particularly sensitive to cancer. Statistics confirm the results of the study: women with breast cancer who have a cortisol cycle are dying earlier.

There is another hormone that confirms the dependence of tumor growth on sleep, - melatonin.

Melatonin is an antioxidant that prevents the destruction of DNA leading to the formation of a tumor. In women, melatonin also slows the production of estrogen, which stimulates the development of breast and uterine tumors.

Women working on shifts and being forced to stay awake at night produce less melatonin, so they are more vulnerable to the action of estrogen. The researchers also found that the incidence of breast cancer among women working in shifts is higher than the average indicators of medicus. En.