 2. To examine the effect of maternal SDB on fetal and neonatal outcome. Methods: 300 women in the third trimester of a singleton uncomplicated pregnancy, who attend a low risk obstetric surveillance will be recruited. Hundred women hospitalized at the Antenatal department due to pregnancy related hypertensive disorder, intrauterine growth restriction IUGR, diabetes mellitus or premature labor will also be recruited. In addition, 200 women of a singleton uncomplicated pregnancy will be recruited during labor at the delivery room. All participants will be asked to complete a designated sleep questionnaire. Based on the questionnaires, women in the third trimester will undergo a sleep study. Medical records review will be conducted after delivery and will include information of maternal blood pressure, labor duration, route of delivery, infant birth weight and APGAR score. Placentas will be collected immediately after delivery from all women. Cord blood will be obtained immediately after delivery and will be analyzed. Post-natal neurobehavioral evaluation will be conducted. Data analysis will be performed on 4 population subgroups: 1 Sleep study proven SDB, 2 Sleep study proven non-SDB, 3 SDB per questionnaire, 4 non-SDB per questionnaire. Comparisons of fetal outcome measures according to group assignment will be performed. In addition, the association between the severity of SDB based on sleep studies degree of hypoxemia, degree of sleep fragmentation, amount of respiratory events and outcome measures will be performed. 