Sleep is one of the earliest casualties of pregnancy. As the body changes and the bump grows, finding a comfortable position becomes a nightly challenge, and questions about what is safe tend to follow.
However, choosing the right sleeping position is essential to support maternal comfort and healthy circulation to the baby.
As such, this guide will provide guidance on sleep positions for each trimester to help you get a good rest throughout your pregnancy.
Best Positions to Sleep in While Pregnant
First Trimester
In the early weeks of pregnancy, most sleeping positions are still safe. Sleeping on the back or stomach is generally fine, as the uterus is still small enough that it does not press on surrounding structures.
However, this period is a useful window to start building the habit of side sleeping. To do so, tuck a pillow under the belly or between the knees to help your body adjust to the position.
Second Trimester
As the baby and uterus grow, side sleeping becomes the preferred pregnant sleeping position.
In particular, sleeping on the left side is beneficial as it improves blood and nutrient flow through the inferior vena cava, the large vein that returns blood from the lower body to the heart.
That said, sleeping on the right side is also acceptable, so you can alternate between sides through the night to relieve stiffness and prevent pressure from building on one side.
Avoid sustained back sleeping from this trimester onwards, as the growing uterus can press on your aorta and inferior vena cava in this position, reducing circulation to both you and the baby.
Third Trimester
Side sleeping is strongly encouraged in the third trimester, with the left side remaining ideal for blood flow.
You can relieve hip and lower back pressure by placing a pillow under the bump, one behind the back, and one between the knees to distribute weight more evenly.
How to Sleep Comfortably When Pregnant (3 Tips)
Knowing the right position is a solid starting point, but physical comfort through the night involves more than just which side to lie on. Here’s how to ensure comfortable sleep when pregnant:
- Invest in a pregnancy pillow: Specially designed pregnancy pillows support the belly, back, and knees, helping you maintain a comfortable side sleeping position without constant readjustment through the night.
- Bend the knees: Adopt a foetal-like position with one or both knees bent to support the lower back and ease back pain.
- Elevate the upper body: Propping up with additional pillows or sleeping in a slight recline relieves back pressure and can reduce acid reflux, which often intensifies in later pregnancy.
- Eat and drink mindfully before bed: While pregnancy cravings may get in the way, try to limit caffeine and avoid large meals close to bedtime to support more settled sleep.
Rest Well to Prepare Well
From the second trimester onwards, the left side-sleeping position is the best option for getting restful nights during pregnancy. From small adjustments in pillow placement to mindful evening habits, you can adopt habits to improve your quality of rest throughout every trimester.
Beyond sleep, pregnancy involves a great deal of preparation in other areas, including nutrition, labour, and newborn care.
That’s where Flegen's pregnancy classes offer an invaluable resource, providing guidance on every stage of the journey. Designed to accompany you through pregnancy, childbirth, and the postpartum period, these antenatal classes offer the knowledge you need to enter your next chapter confidently.
And as your due date approaches, our newborn care class provides the hands-on guidance you need to approach your first six weeks postpartum and beyond. Through essential skills like nursing, bathing, and soothing, you’ll feel empowered to welcome and care for your little one.
So, feel fully informed and supported as you prepare to welcome your baby. Book a call with us today!
Frequently Asked Questions About Pregnancy Sleep Positions
Is Sleeping on the Back Safe When Pregnant?
In the early weeks, the occasional back sleeping position is unlikely to cause harm. However, from the second trimester onwards, consistent back sleeping during pregnancy is discouraged, as the growing uterus can press on the inferior vena cava and reduce blood flow to the heart and baby.
When Should I Stop Sleeping on My Back During Pregnancy?
Most healthcare providers recommend transitioning away from back sleeping by the end of the first trimester, or as the second trimester begins.
What If I Wake Up on My Back When Pregnant?
Even after going to sleep on the side, waking up on the back is very common as the body shifts naturally during sleep. However, there’s no need to panic. Simply roll back onto your side and continue resting.
How Do I Stay in a Side-Sleeping Position Through the Night?
You can place a rolled blanket or pillow firmly behind the back to create a physical barrier against rolling. Alternatively, a full-length pregnancy pillow that wraps around the front and back of the body provides additional support and reduces the urge to shift positions through the night.