Getting comfortable enough to sleep can feel like a puzzle as your bump grows. The good news: there’s a simple, well-known answer, and a few pillow tricks make a big difference. Here’s what to know about the best sleeping positions through each stage of pregnancy.
This is general information, not medical advice — check with your doctor or midwife about what’s right for you.
What is the best sleeping position during pregnancy?
In later pregnancy, sleeping on your side is the position most often recommended — and the left side is the classic suggestion. Lying on your side keeps blood and nutrients flowing well to your baby and to your own organs, and it tends to be the comfiest spot for a growing bump anyway.
Why the left in particular? A large vein called the vena cava runs down the right side of your spine, carrying blood back to your heart. Resting slightly to the left takes pressure off it. That said, either side is good — the key message is side, not back. If you’re a natural right-side sleeper, don’t lose sleep over switching.
In early pregnancy, none of this matters much yet. Your uterus is still small and tucked safely behind your pelvic bone, so sleep in whatever position feels good while you still can — you’ll have plenty of time to adjust later.
Why does sleeping on my back get uncomfortable?
As your uterus grows heavier, lying flat on your back lets its weight press on that big blood vessel and on your spine. For some people this brings on dizziness, breathlessness, backache, or a racing heart — your body’s way of nudging you to move.
That’s why most guidance suggests settling to sleep on your side from around the third trimester (about 28 weeks). It’s about how you fall asleep, not policing every second of the night.
If you doze off on your side and wake up on your back, don’t panic — that’s incredibly common. Just roll back over. Your body is good at signalling when something’s uncomfortable, even in sleep.
How do pillows help me get comfortable?
Pillows are the secret to side-sleeping that actually feels good. A few simple set-ups:
- Between your knees — keeps your hips and lower back aligned and eases pressure. This is the single most helpful one.
- Under your bump — a small or folded pillow supports the weight so your tummy isn’t pulling down.
- Behind your back — a pillow wedged there gives something to lean on and makes it harder to roll fully flat.
- Hugged to your chest — a full-length or body pillow to wrap an arm and leg around feels cosy and stops you rolling forward.
You don’t need a special pregnancy pillow — a couple of regular pillows do the same job. If you do buy one, a long body pillow or a U/C-shaped one can replace the whole pile and stop pillows wandering off during the night. The goal is simply to fill the gaps your body leaves so nothing is left straining to hold itself up.
Comfort tips trimester by trimester
Comfort changes as you go, so here’s a quick guide:
| Stage | What usually helps |
|---|---|
| First trimester | Sleep however you like — front, back or side. Sore breasts? A soft bra or pillow can help. |
| Second trimester | Start easing onto your side; a knee pillow makes it natural before you truly need it. |
| Third trimester | Side-sleeping with pillows; prop up a little if heartburn or breathlessness strikes. |
Heartburn, leg cramps, a restless mind and frequent trips to the bathroom are all common reasons sleep gets patchy, and they tend to peak in the third trimester. None of them mean anything is wrong — they’re just your body and baby taking up more room.
A few extra things that help at any stage:
- Cut back on fluids close to bedtime (but stay well hydrated in the day) to reduce trips to the loo.
- Prop your upper body up with an extra pillow if heartburn or a stuffy nose keeps you awake.
- Get up slowly if you need the bathroom at night, to avoid dizziness.
- Keep a calm wind-down — dim lights, no screens — since pregnancy can make sleep lighter anyway.
What if I still can’t sleep?
Broken sleep is one of the most normal parts of pregnancy, especially near the end — partly the bump, partly a busy mind, partly practice for the months ahead. Be kind to yourself: nap when you can, and don’t lie there tense and counting hours. If you’re wide awake, it’s often better to get up, do something quiet and dim for a little while, and go back when you feel sleepy again.
It can help to plan around the days ahead, too. If you’re tracking how far along you are or counting down to your due date, our due date calculator gives you a clear timeline, and our pregnancy calendar maps out what each week brings — handy for knowing when to start prioritising side-sleeping.
If sleep problems feel severe, or you have pain, strong dizziness, or notice changes in your baby’s movements, don’t tough it out — reach out to your doctor or midwife. That’s exactly what they’re there for.
This article is for general information only and isn’t medical advice. Always follow current guidance and your healthcare provider is the best person to ask about your own pregnancy.