Sleep apnea is a condition in which people stop breathing during sleep, causing fatigue and daytime sleepiness. The American Sleep Foundation estimated that 10-15 percent of pregnant women have sleep apnea. There are several ways to manage sleep apnea during pregnancy, including using a CPAP machine, using a continuous positive airway pressure mask, or using a combination of the two. It's important to talk to your doctor about the best way to manage your sleep apnea.