OSA may develop or worsen during pregnancy and impact maternal-fetal health. The prevalence of OSA in pregnancy is unknown, largely due to the lack of epidemiological studies using PSG. Many studies rely on subjective screening tools. Using the Berlin questionnaire, 25% of pregnant women are OSA suspects. Frequent snoring, the most common symptom of OSA, is reported in 16% of women in late pregnancy. Snoring nearly doubles from pre-pregnancy to the final month of pregnancy along with other symptoms, such as witnessed apneas.19 As in the general population, the risk of OSA increases with BMI and neck girth. However, OSA also affects non-obese women. Symptoms of OSA often improve or resolve in the postpartum period. In one series, the postpartum AHI declined by 1/3 compared with the third trimester. Women with persistent OSA require follow-up as untreated OSA produces a constellation of adverse medical, psychiatric, and social consequences.