The arterial duct refers to a continuous duct between the main trunk of the pulmonary artery and the aorta during the embryonic period of the fetus. Through this duct, blood from the placenta can be delivered to the infant's body for tissue oxygenation.

Therefore, the arterial duct is originally a normal tissue in the embryo. After the birth of the infant, the majority of arterial ducts will close within a few months. If it has not closed after one year, it can be diagnosed as congenital patent ductus arteriosus. Therefore, there is no relationship between patent ductus arteriosus and staying up late during pregnancy.