A Serious but Often Overlooked Risk During Pregnancy
Sleep apnea during pregnancy is more common than most people realize — and more dangerous. Studies estimate that the prevalence of sleep apnea increases two to three times during pregnancy, driven by weight gain, hormonal changes, nasal congestion, and the physical changes of a growing uterus. Yet it is rarely screened for during prenatal care, leaving many pregnant women with an undiagnosed condition that poses real risks to both mother and baby.
Why Pregnancy Increases Sleep Apnea Risk
- Weight gain — increases fat deposits around the airway and neck
- Nasal congestion — progesterone-driven swelling of nasal mucosa forces mouth breathing
- Uterine growth — displaces the diaphragm upward, reducing lung capacity and making airway collapse more likely
- Fluid retention — increases soft tissue bulk in the upper airway
- Progesterone effects — while progesterone has some airway-protective effects, the net hormonal changes of pregnancy increase OSA risk, particularly in the third trimester
Risks of Untreated Sleep Apnea During Pregnancy
Untreated sleep apnea during pregnancy is associated with a range of serious complications for both mother and fetus:
- Gestational hypertension and preeclampsia — sleep apnea is an independent risk factor for hypertensive disorders of pregnancy
- Gestational diabetes — intermittent hypoxia impairs glucose metabolism
- Preterm birth
- Fetal growth restriction — repeated oxygen desaturation can reduce oxygen delivery to the fetus
- Cesarean delivery — higher rates in patients with untreated sleep apnea
- Postpartum depression — exacerbated by chronic sleep deprivation
Symptoms of Sleep Apnea During Pregnancy
Snoring is a common and often normalized experience during pregnancy, but persistent loud snoring — particularly when accompanied by daytime fatigue, morning headaches, or observed breathing pauses — warrants evaluation. Pregnant women are also more likely to present with insomnia and excessive daytime sleepiness, which can mask the sleep apnea component.
Safe Treatment Options During Pregnancy
CPAP is the most commonly prescribed treatment for sleep apnea during pregnancy and is considered safe. For pregnant patients who cannot tolerate CPAP or who have mild OSA, positional therapy (avoiding back sleeping, which worsens OSA) and conservative measures may be helpful. Oral appliance therapy can be considered in consultation with a dental sleep medicine specialist and the patient's obstetrician, particularly for mild to moderate cases. All treatment decisions during pregnancy should be made in collaboration with the patient's obstetric care team.
After Delivery
Many women whose sleep apnea was triggered or worsened by pregnancy experience improvement postpartum as weight, fluid retention, and hormonal changes normalize. However, a follow-up sleep study six to eight weeks after delivery is recommended to reassess whether continued treatment is needed. Women with OSA prior to pregnancy are likely to require ongoing treatment.