Studies have proven is published by professional societies in research on tumor link a woman's tumors night work or disorder, which affects their working hours in the disruption of daily systems administrator in turn punish cases of vigilance and sleep and control the number of biological functions of the body.
There are many theories that linked between tumors and the above factors, including the exposure to night-light limits the secretion night of the hormone melatonin (the hormone secreted by the pineal gland in the brain), which represents a factor of anti-tumor, disorder genes of the biological clock that controls the reproductive cell and the sleep disorders weaken the immune system.
Underwent up to 3000 a French woman of the study and reached the proportion of women working at night to 11% and proved to increase the proportion of injury these women's tumors by 30% in comparison with other workers in the times of the day, and apply this percentage to women working at night for more than four years or for women who are missing systems work weekly for 3 nights per week, which increases the frequency disturbance between systems day and night.
The lack of differentiation of mammary cells completely before the first pregnancy for women working at night before her pregnancy confirmation of the link between night work and increase the chance of breast cancer.
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