Snoring in Pregnancy: Sleep Apnea, Blood Pressure, and a Healthier Pregnancy

Loud snoring in pregnancy can be a sign of sleep apnea. Sleep apnea is linked to high blood pressure and preeclampsia (a serious blood pressure problem in pregnancy). Pregnancy itself may bring on sleep apnea or make it worse.¹ Some studies found that treating it with CPAP was linked to lower blood pressure and fewer cases of preeclampsia. But not every trial has shown a benefit, and many pregnant women find CPAP hard to use regularly.^1,2,3

Is snoring in pregnancy normal?

Loud, frequent snoring in pregnancy can point to obstructive sleep apnea (OSA). In OSA, the throat narrows or closes during sleep. This causes pauses in breathing and drops in oxygen. Doctors measure it with the apnea-hypopnea index (AHI). This is the number of pauses and shallow breaths per hour of sleep.

Pregnancy may help cause sleep apnea or make it worse. And sleep apnea may raise the risk of problems in pregnancy.¹ One study looked at pregnant women with obesity. More than a third of those tested had sleep apnea in the mild-to-moderately-severe range.³

Is sleep apnea linked to preeclampsia?

Gestational hypertension is high blood pressure that starts during pregnancy. Preeclampsia is more serious. It means high blood pressure plus signs of stress on organs such as the kidneys or liver.

Sleep apnea in pregnancy is a risk factor for preeclampsia. This may happen through effects on the placenta (the organ that feeds the baby).²

Does CPAP lower the risk of high blood pressure in pregnancy?

CPAP (continuous positive airway pressure) is a bedside machine. It gently blows air through a mask to keep the airway open during sleep. It is the first treatment doctors use for sleep apnea. It is also seen as the most practical choice during pregnancy.¹

A 2024 review combined six studies with 809 pregnant women who had sleep apnea. CPAP use was linked to about 35% lower risk of gestational hypertension. It was also linked to about 30% lower risk of preeclampsia.¹

A randomized trial in Thailand took place at several hospitals. In a randomized trial, chance decides who gets the treatment. This one enrolled 340 women with high-risk pregnancies. For example, some had long-term high blood pressure, obesity, diabetes, or preeclampsia in a past pregnancy. All of them also had mild to moderate sleep apnea. Some got CPAP and some got usual prenatal care.

CPAP lowered the bottom blood pressure number by about 2 points. The effect lasted through the pregnancy. Preeclampsia occurred in 13.1% of the CPAP group versus 22.3% of the usual-care group. That is about 13% compared with 22%. This happened even though women used CPAP only about 2.5 hours a night on average.²

Why don't all studies agree?

Another trial tested auto-adjusting CPAP in pregnant women with obesity and sleep apnea. It found no difference in its main combined measure. That measure included blood flow to the placenta, pregnancy-related blood markers, and insulin resistance (when the body does not respond well to insulin). Blood pressure did not differ either.

CPAP use in that trial was very low, about 0.3 to 1.3 hours a night on average. Women who used it more had lower fasting blood sugar (blood sugar before eating).³

A 2026 review looked at seven studies in high-risk pregnancies. It found that CPAP lowered fasting blood sugar and insulin resistance. But it found no clear differences in most other results for mothers or babies:⁴

• Mothers — Blood pressure problems and cesarean (C-section) delivery.
• Babies — Preterm (early) birth, birth weight, and newborn intensive care stays.

So the evidence is promising for blood pressure but mixed overall. Low CPAP use is a common problem. It may be one reason results differ between studies.^2,3

Is CPAP safe to use during pregnancy?

CPAP is the standard first treatment for sleep apnea. It is seen as the most workable choice during pregnancy.¹ It uses only air pressure, with no medicine involved.

Comfort matters a lot. A stuffy nose, a growing belly, and waking often can make it harder to use. A well-fitted mask and quick follow-up help.

How does Universal Sleep Solutions help?

At Universal Sleep Solutions we offer home sleep testing and in-lab sleep studies for adults, including pregnant women. We set up CPAP and follow up closely to help you find a comfortable mask and settings. We are glad to share results with your obstetrician (pregnancy doctor) or maternal-fetal medicine team (high-risk pregnancy doctors).

When should you get checked for sleep apnea?

Talk with your pregnancy care provider about a sleep checkup if you are pregnant and:

• Night signs — You snore loudly, or someone has seen you stop breathing or gasp in your sleep.
• Daytime sleepiness — You feel very sleepy during the day.
• Pregnancy problems — You have high blood pressure, gestational diabetes (diabetes that starts in pregnancy), or preeclampsia now or in a past pregnancy.
• Other risks — You have obesity, diabetes, or another high-risk pregnancy condition.

In the trial that found fewer cases of preeclampsia, almost all women started in the first trimester (the first 3 months).² If you have concerns, it is reasonable to ask early.