Accidentally sleeping on your back during pregnancy, especially after 28 weeks, isn't a major cause for alarm; just roll onto your side (left is ideal) as your body often wakes you if it's uncomfortable, but aim to fall asleep on your side to prevent pressure on major blood vessels that supply oxygen and blood to your baby. Using pillows for support, especially under your hips or between your knees, helps maintain comfortable side-sleeping positions.
In the second and third trimesters, lying on your back may compress a major blood vessel that takes blood to your uterus, making you feel dizzy and possibly reducing blood flow to your fetus. Sleeping on your side during your second and third trimesters may be best. Keep one or both knees bent.
If you wake up on your back, just settle back to sleep on your side. We cannot control our position when we are asleep and a large bump is likely to be uncomfortable enough to prevent you from being on your back for long during the night.
It is generally safe for people to sleep on their stomach during pregnancy, although it may be uncomfortable and cause back or neck pain. Research suggests that it is safe for people to sleep in whichever position they prefer until around 30 weeks of gestation.
There isn't much to worry about if you somehow find yourself on your stomach. The uterine walls and amniotic fluid protect your baby from being squished. Your unborn baby is well protected by amniotic fluid and the uterine walls, making it unlikely that sleeping positions will harm them.
Five key warning signs during pregnancy needing immediate medical attention include vaginal bleeding, severe headaches with vision changes, decreased baby movement, severe abdominal pain/cramping, and signs of preterm labor like regular contractions or fluid leakage, as these can signal serious issues like miscarriage, preeclampsia, placental problems, or infection. Always contact your healthcare provider or seek emergency care for these symptoms.
Ross suggests limiting your time on your back to one to two hours at this point: “Sleeping on your back for long periods of time can ultimately reduce the blood flow to baby, which can affect [their] growth and overall health,” she says.
When Should You Stop Sleeping on Your Back When Pregnant? Most experts agree it's best to avoid sleeping on your back after 20 weeks. After that, the weight of your uterus begins to put pressure on the inferior vena cava, disrupting blood flow to the heart and fetus.
Sleeping on your back: This can cause problems with backaches, breathing, the digestive system, hemorrhoids, low blood pressure and cause a decrease in circulation to your heart and your baby. This is a result of your growing abdomen resting on your intestines and major blood vessels (the aorta and vena cava).
Prenatal sleep
At first, we need to clarify one thing: it's a known fact that babies sleep in their mother's womb. They usually sleep when their mothers are going about their everyday chores. It's almost as though the mother's daily routine would seem to reassure the fetus, which sleeps until mom goes to bed at night.
Here is a short list of new symptoms you may experience with your change in blood flow:
Among the most worrisome causes of pregnancy back pain is preterm labor. Women should watch for pain that is new and cyclical — which could be a sign of uterine contractions — along with vaginal bleeding or any change in vaginal discharge that could indicate a placental issue or an early rupture of your waters.
Lying on your back is not advised because of pressure on the inferior vena cava. That is a major vein that returns blood from the lower body to the heart. The increased pressure on the back and intestines can also cause discomfort. The best sleeping position during pregnancy is on your side.
Most people don't experience this low blood pressure associated with sleeping on their back, so you can be reassured that if you wake up on your back, it's unlikely to have ill effects to the baby. Those who do experience low blood pressure may have symptoms of nausea, dizziness and shortness of breath.
This varies, but your belly usually starts feeling hard during your second or third trimester. As your uterus grows, it eventually pushes against your abdominal wall, making your abdomen feel firm. The muscles and ligaments around your uterus stretch, too, which can cause mild cramping, called round ligament pain.
Many physicians advise pregnant women to sleep on their left side. Previous studies have linked back and right-side sleeping with a higher risk of stillbirth, reduced fetal growth, low birth weight, and preeclampsia, a life-threatening high blood pressure disorder that affects the mother.
While sleeping on your back while pregnant isn't ideal, it's not likely going to do any lasting harm.
Insomnia affects most pregnant women at some point. Your chances of having to deal with insomnia increase as your pregnancy progresses. About 1 in 4 women (25%) have insomnia in early pregnancy (the first trimester). Up to 80% of women report insomnia symptoms by the end of the third trimester.
The reason doctors recommend that you sleep on your side is because lying on your back during the later stages of your pregnancy puts pressure on your major blood vessels. This can reduce the flow of blood to your uterus and restrict your baby's oxygen supply. This can also affect their heart rate.
The "3-2-1 Rule" in pregnancy is a guideline for first-time mothers to know when to call their midwife or doctor for active labor: consistent contractions that are 3 minutes apart, lasting 2 minutes each, for 1 hour (or sometimes cited as 3-1-1, meaning 3 minutes apart, 1 minute long, for 1 hour). For subsequent pregnancies, the 5-1-1 Rule (5 minutes apart, 1 minute long, for 1 hour) is often used, indicating labor is progressing more quickly.
Top 5 Conditions of Abnormal Pregnancy
Babies are very aware of any friction between the people around them. Arguments and upsets are not good for your baby's brain development, both before and after they are born. It makes it harder for them to feel safe and secure and build strong bonds.
There's no single "hardest" month, as challenges vary, but many find the first trimester tough due to nausea, fatigue, and hormonal shifts, while the third trimester (months 7-9) often brings the most physical discomfort from the baby's size, affecting sleep, mobility, and causing aches, heartburn, and frequent urination. The difficulty often shifts as pregnancy progresses, with the first months focused on adjustment and the later months on physical strain and preparation for birth.
Although there is no consensus on the full spectrum of forbidden points,3 those most frequently cited as contraindicated throughout pregnancy (at least before 37 weeks) are SP6, LI4, BL60, BL67, GB21, LU7, and points in the lower abdomen (eg, CV3–CV7) and sacral region (eg, BL27–34).
The second trimester often brings some relief. But by the third trimester, it can become hard to find a comfortable sleeping position. At this stage, high levels of estrogen can also cause some women to develop rhinitis (swelling of the nasal tissue), which can be associated with snoring and obstructive sleep apnea.