 Sleep disordered breathing SDB during pregnancy is a modifiable risk factor for poor maternal and fetal outcomes. The investigators propose a prospective observational study to assess the utility of continuous positive airway pressure CPAP administration intervention during pregnancy to reduce maternal and fetal morbidity. Secondarily, we will also perform a cohort study to assess the incidence of antenatal sleep-disordered breathing as measured by ambulatory sleep monitoring applied in the hospital setting. 