During this time, women who often work at night is believed to be difficult pregnancy.But the results of an analysis of several studies indicate, the relationship between working the night with the reproductive system is not very significant and can be ignored.

The notion that women who often work at night difficult pregnancy based on changes in biological clock. Women who are irregular biological clock will experience hormonal changes during this condition is believed to trigger a variety of reproductive problems.

In addition to being difficult pregnancy, hormonal cycle changes were also made women often experience irregular menstruation. If it can get pregnant, sometimes the stakes are high for preterm delivery and babies born with low weight.

But this assumption is refuted by the results of the analysis conducted by Dr. Matteo Bonzini from the University of Insubria in Italy, against 23 studies that have been done before. The number of participants involved in each study are quite diverse, ranging from 700 to 35,000 people.

Of the many studies that were analyzed, some did show an association between the incoming night with hormonal imbalance. One is the research conducted in the United States against the nurses in some hospitals.

Compared to women with other professions, nurses are frequently picket the night in the hospital more often experience irregular periods. Although it is believed that this trend affect fertility, but there was not enough evidence to conclude the case.

Overall, 23 studies were on average showed that women who often work at night had a 16 percent greater risk for problems with the reproductive system. Judging from the number, the risk is quite significant.

But Dr Bonzini said several other factors make that number becomes insignificant because of reproductive problems is not directly triggered by the habit of working at night. Other factors which meant among other social factors, economics and lifestyle.

According to Dr. Bonzini, women are often included nights are usually relatively low-income so it is difficult to access health care. In addition, some women do not feel sleepy so night workers often consume coffee and cigarettes that would affect his health.

“The evidence currently available does not require companies to restrict women to work at night, in conjunction with the opportunity to have children,” said Dr. Bonzini quoted as saying by Reuters.