Pregnancy is a time of extensive physiologic, physical, and hormonal changes. These changes can significantly disrupt a woman’s sleep and can result in symptoms of daytime sleepiness and fatigue. Understanding how sleep is altered during pregnancy and recognizing sleep disorders that commonly develop during pregnancy may enable healthcare professionals to identify and treat sleep problems. Sleep is vital to the health and well-being of pregnant women. By counseling women on strategies to optimize sleep, healthcare professionals may improve the quality of nighttime sleep and reduce daytime sleepiness and fatigue.