A British survey shows that night shifts may impair women’s fertility, so women who work nights have a significantly higher chance of infertility. This is the conclusion of researchers at the University of Southampton, who surveyed more than 100,000 adult women. The pediatrician who led the survey, Lyndon K. Stoker said at the European Society of Human Reproduction and Embryology meeting, the findings show that, compared with the 9 to 5 a family, only the night shift women’s difficulty in getting pregnant will increase by 80%, day and night shift women failed to get pregnant within a year the chances of doubling. The researchers found that all work patterns except frequent day shifts increased women’s chances of menstrual cycle disorders by 20 percent and increased the risk of miscarriage after pregnancy by about one-third. Fertility in this investigation refers to natural conception rather than in vitro fertilization. The British newspaper “Daily Mail” recently cited Stoker reported that the night shift and female fertility may be associated with the cause of work, irregular sleep schedule caused by the disruption of the female biological clock, which plays an important role in the control of human hormone secretion, body temperature, blood pressure and heart rate. She said the possibility of other factors playing a role, such as day and night shift workers prone to irregular diet, lack of exercise and other problems, cannot be ruled out here. ”We don’t fully understand why shift workers are at increased risk for certain diseases,” Stork said, “but what is clear is that shift work can affect your physical functioning, mental functioning and social functioning.” Stork said sleep disorders and fertility problems are not causally related, and that the results shown in this survey have yet to be proven by other studies before recommendations can be made for shift workers. She said that women need to pay attention to a number of factors in addition to sleep in order to improve fertility. For example, they should get as much rest as possible, stick to a balanced diet, engage in moderate physical activity, and make good use of their rest time to promote physical and mental health as much as possible. The results of some previous studies also show that working night shifts or day and night shifts is not good for health. The World Health Organization says that shift work may increase a woman’s risk of developing breast cancer. The Royal College of Physicians found an association between shift work and premature birth and low birth weight in newborns.