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Is Sleeping on Your Back During Pregnancy Really That Bad?

  • September 12, 2023

Getting a decent night’s rest is critical for both maternal and fetal well-being. However, as your bump grows, so does the "noise" around how you should be positioned. The subject of sleeping on your back during pregnancy has been a topic of much debate, often leaving mums-to-be feeling more anxious than rested.

In this guide, we’re cutting through the confusion to explore the pros and cons of lying supine (on your back) while expecting, backed by current research. Plus, we’ll look at how practical tools like a specialised maternity pillow can offer a comfortable, stress-free alternative.

Understanding the Risks: Why the Concern?

Medical professionals generally advise against sleeping on your back once you enter the second and third trimesters. The logic is purely anatomical: when you lie flat, the combined weight of your growing uterus, the placenta, and your bub can compress major blood vessels, specifically the inferior vena cava.

Potential risks associated with prolonged back-sleeping include:

  • Circulatory Strain: Compression can affect how efficiently blood returns to your heart, sometimes causing dizziness or "supine hypotensive syndrome."

  • Placental Blood Flow: According to clinical guidelines from The Royal Women’s Hospital, lying on your back can subtly impact the flow of blood and nutrients to the placenta.

  • Sleep Quality: Back-sleeping is often linked to increased snoring and even sleep apnoea during pregnancy.

What Does the Research Say?

It’s important to note that studies on this subject offer varying conclusions, which is why the debate continues to evolve.

  • The "Side is Best" Evidence: Significant Australian research, highlighted by Pregnancy, Birth and Baby, suggests that after 28 weeks, the risk of complications is lower when women go to sleep on their side. This is why the "Left is Best" (or either side) message is so consistent in Aussie prenatal classes.

  • The Nuance: While one study might show an association with lower birth weight, others, as noted in the Doctor of General Practice, emphasise that it is just one of many factors.

The takeaway? While you shouldn't panic if you wake up on your back, the general medical consensus in Australia leans strongly towards side-sleeping as a preventative, low-effort way to ensure the best outcomes for bub. This is especially true if you are carrying more than one baby; if that's you, check out our guide on how to safely sleep with twins or multiples.

Finding the Right Position: The "S.O.S" Strategy

The gold standard for pregnant women is "S.O.S" (Sleep On Side). Specifically, sleeping on your left side is often touted as the "perfect" position because it keeps the uterus off the liver and maximizes blood flow to the heart.

Safe alternatives include:

  • Right-side sleeping: While the left is often preferred, sleeping on your right side is still significantly safer than lying on your back.

  • Semi-reclined: If you’re struggling with heartburn or breathlessness, propping yourself up with pillows can offer relief.

  • The "Wedge" Method: Using a support system to maintain a side-tilted position, even if you aren't fully 90 degrees on your side.

How to Stay Off Your Back (Without the Anxiety)

If you find yourself unconsciously reverting to a supine position the moment you drift off, you aren't alone. Our bodies have years of "muscle memory." Here’s how to hack your habits:

1. Invest in a Specialised Maternity Pillow

DIY hacks like rolled-up towels often shift during the night, leaving you back where you started. A specialised tool like the Sleepybelly Pregnancy Pillow is designed to solve this exact problem. Its 3-piece adjustable design that wedges you in from the front and back. It physically makes it difficult to roll onto your back, providing a "set and forget" solution that lets you focus on actually sleeping.

2. Manage Daytime Fluid to Reduce Nighttime Tossing

Restlessness is a major reason why women roll onto their backs in their sleep. Often, this "fidgety" feeling is caused by fluid buildup and restless legs that have accumulated throughout the day. By wearing Sleepybelly Maternity Compression Socks during the day, you help your circulation stay on track. When your legs feel light and ache-free by bedtime, you're much more likely to settle into a side-sleeping position and stay there, rather than thrashing around and ending up on your back.

3. Involve Your Partner

Encourage your partner to be your "sleep coach." If they wake up in the night and notice you’ve rolled onto your back, a gentle nudge to help you reposition can be invaluable. It’s a simple way for them to support your comfort and the baby’s safety.

Final Thoughts: Weighing Your Options

The conversation surrounding sleeping positions during pregnancy is complex, but the goal is simple: ensuring the well-being of both you and your baby.

By staying informed and using supportive devices, whether that’s an adjustable pillow to keep you tucked on your side or compression socks to settle restless legs, you can take the worry out of your nights. Remember, every pregnancy is unique. Choose the solution that best suits your body, and if you're ever in doubt, your midwife is only a phone call away.

Ready for a worry-free night? Discover the Sleepybelly range and see how Australian-designed support can transform your pregnancy sleep.

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What Should a Baby Wear Under a Sleep Sack? Australian TOG and Temperature Guide

What Should a Baby Wear Under a Sleep Sack? Australian TOG and Temperature Guide

Dressing a baby under a sleep sack properly relies on understanding Thermal Overall Grade (TOG) ratings, selecting breathable natural fabrics, and matching layers to the actual room temperature. TOG measures insulation: lower ratings (0.2–0.5 TOG) suit hot summer nights, 1.0 TOG works for mild spring or autumn rooms, and 2.5 TOG provides padded warmth for cool winter temperatures. Because there is no universal Australian TOG safety standard, always treat temperature guides as a helpful starting point alongside checking your baby directly.

Rather than relying on room thermometers, which Red Nose Australia notes are not strictly necessary, dress your baby for room temperature much like you would dress yourself, ensuring their head and face remain completely uncovered. On cool nights (16°C to 20°C) with a 2.5 TOG bag, use a long-sleeve cotton suit or ribbed pyjamas, adding a cotton singlet if temperatures drop near 16°C. For mild rooms (20°C to 22°C) under a 1.0 TOG bag, a long-sleeve bodysuit is ideal. In warm rooms (22°C to 24°C), a short-sleeve bodysuit or singlet paired with a 1.0 TOG bag works best, while hot rooms above 24°C require only a 0.2 to 0.5 TOG lightweight bag over a singlet or nappy.

Stick to natural fibres like GOTS-certified organic cotton, which allow air movement and wick moisture away from sensitive newborn skin better than synthetic fleece. To verify if your baby is comfortably dressed, ignore cold hands or feet, which are completely normal due to developing circulation, and feel their tummy, chest, or the back of their neck instead. If the skin feels hot, sweaty, or clammy, remove a layer or opt for a lighter TOG; if it feels cool, add a long-sleeve cotton base layer to ensure a safe, comfortable sleep.
How Long Should You Wear Compression Socks Each Day During Pregnancy?

How Long Should You Wear Compression Socks Each Day During Pregnancy?

For most healthy pregnancies, the optimal routine is to wear maternity compression socks for 8 to 12 hours during your active daytime hours and take them off before sleep. Putting them on first thing in the morning, before fluid pools in your lower limbs, allows the graduated compression profile to actively manage fluid retention throughout your day. Taking them off at night is essential because lying flat levels your legs with your heart, rendering the socks unnecessary while giving your skin time to breathe.

This 8 to 12 hour window fits standard daily waking routines, whether you are sitting at a desk, working long standing shifts, or running errands. Compression socks are also highly beneficial during travel involving more than four hours of sitting to maintain healthy blood flow. While keeping them on for a brief daytime nap of 30 to 60 minutes is perfectly fine, they should always be removed for a full night's rest.

Pregnancy Compression Sock Size Guide: How to Measure for the Right Fit

Pregnancy Compression Sock Size Guide: How to Measure for the Right Fit

Ensuring proper fit for maternity compression socks is critical for managing pregnancy swelling and leg heaviness. Because compression socks use a graduated profile—firmest at the ankle and easing up the calf, an improper fit disrupts circulation benefits. Socks that are too large wrinkle and fail to deliver support, while undersized socks create a restrictive band that worsens fluid retention.

To ensure an accurate fit, always measure first thing in the morning when your legs are slimmest before daily fluid accumulation begins. Using a flexible tape measure, record the circumference of the narrowest part of your ankle (just above the bone) and the widest part of your calf in centimeters. Compare these numbers against a size chart, prioritizing ankle and calf dimensions over shoe size to maintain proper gradient pressure. If you fall between sizes, size up for ease of wear or earlier trimesters, and size down for a firmer, more supportive fit.

When putting on your socks, avoid hauling on the fabric over a third-trimester bump by using the unrolling method: turn the leg section inside out down to the heel, slide your foot into the footbed, and unroll the fabric smoothly up your calf. Ensure the top band sits roughly two finger-widths below the bend of your knee without rolling the cuff down, which prevents painful pressure bands and guarantees all-day circulatory support.

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