When Should Pregnant Women Start Sleeping on Their Side

Pregnancy sleep can feel like a moving target—one week you’re told “side,” the next you’re wondering if you can still roll onto your back for a bit. The big theme from the top search results is pretty simple: start aiming for side sleeping in the third trimester, and some results give a more specific target of around 28 weeks. They also mention that this applies to night sleep and daytime naps. And when people talk about the safest side, you’ll usually hear left side mentioned for blood flow to the placenta.

Below is a question-led timeline that matches what people often ask at 13, 14, and 17 weeks, plus right vs left, and a practical “what to do when you wake up on your back” reset.

Side sleeping timing in pregnancy: what the top results suggest (including 28 weeks and third trimester)

Here’s the timing message you’ll keep seeing:

• Third trimester = go to sleep on your side. The results frame side sleeping in the third trimester as the safer option for baby.
• Around 28 weeks = a common “switch” point. One snippet says that going to sleep on your side from 28 weeks can halve the risk of stillbirth compared with going to sleep on your back.
• Night sleep and daytime naps count. The guidance is not only about what happens at night. It also mentions daytime naps.

You’ll also see a balancing point in the snippets:

• Sleeping on the back or side through the 30th week doesn’t appear to increase certain risks (like stillbirth and reduced size at birth).

That means the overall approach is usually: don’t panic in early pregnancy, but make a plan to shift your usual sleep position toward side sleeping as you reach the third trimester—with 28 weeks being the common “mark” people use.

Also, if you’re reading this because your clinician gave you specific rules, follow their guidance. Pregnancy can be personal, and your situation may have extra considerations.

Can I sleep on my back at 14 weeks pregnant?

At 14 weeks, you’re still in the earlier part of pregnancy. The top results you’re competing with focus their “do this” message on the third trimester, and they highlight a specific switch around 28 weeks.

So based on the timing info in the search snippets:

• There isn’t a specific “stop sleeping on your back at 14 weeks” week mentioned in the snippet guidance.
• The strong, repeated recommendation is to start aiming for side sleeping in the third trimester, and around 28 weeks is often used as a practical start.

In other words, the SERP pattern isn’t giving a “you must change at 14 weeks” rule. It’s more like: prepare to switch later, and then make side sleeping your default as you get closer to the third trimester.

If you’re feeling uncomfortable on your back (pressure, stiffness, heartburn, whatever applies to you), that’s a good enough reason to try side sleeping now—even if the “official” shift point is later.

Is it okay to lay on your back at 17 weeks pregnant?

Same idea as 14 weeks—the search snippets don’t point to a “17 weeks is the cutoff” rule.

One snippet does include this kind of reassurance:

• Back sleeping or side sleeping through the 30th week doesn’t appear to increase the risk of stillbirth or reduced size at birth (as described in the SERP).

So for 17 weeks, you’re well before the third-trimester push that the top results emphasize. The SERP is not framing 17 weeks back sleeping as a special problem.

If you’re trying to follow the spirit of the guidance without stressing out, you can treat this as a planning stage:

• Keep yourself comfortable now.
• As you get closer to 28 weeks, start making side sleeping your usual position.

Can I lay on your belly at 13 weeks pregnant?

This is one of the common PAA questions at 13 weeks, but the snippets provided don’t include a direct belly-sleeping rule for that exact week.

What the SERP *does* focus on is side sleeping timing in the third trimester, especially around 28 weeks. So there’s not enough snippet-based info here to give you a “yes/no, and here’s the rule at 13 weeks belly sleeping” answer.

What you *can* do with the guidance you do have:

• Use the third-trimester / 28-weeks side-sleeping timeline as your main target.
• If belly sleeping feels uncomfortable, you can start switching positions earlier just for comfort.

If your clinician has told you something specific about positions (because of your symptoms, placenta location, or other factors), that’s the kind of advice that beats general internet rules.

Am I allowed to sleep on my right side while pregnant?

Yes—side sleeping is the key theme, and right-side is still side sleeping.

The snippets clearly mention side sleeping as the safer direction in the third trimester, and they also say it applies to night sleep and daytime naps.

Where the details get more specific is this:

• The SERP snippets emphasize that sleeping on the side—especially the left—improves blood flow to the placenta.

So a practical way to read it is:

• Right side is still part of “side sleeping.”
• Left side is called out as the better option for blood flow.

If you wake up on your right side, you don’t need to feel like you “broke the rules.” You can simply switch to your left side again when you’re comfortable doing so.

Left vs right side: what the SERP snippets say about left-side sleeping and blood flow

This is the clearest right-vs-left message from the search results:

• Left-side is often recommended because it helps improve blood flow to the placenta.
• Side sleeping is recommended overall in the third trimester, but the left side gets the extra “especially” note.

If you want a simple plan:

• Try to fall asleep on your left side once you’re in that third-trimester window (or once you’re working toward it around 28 weeks).
• If you roll to the right, treat it like a normal part of sleep and adjust when you notice.

How to make side sleeping easier (pillows, mattress comfort, and daytime naps)

The guidance from the top results is timing-focused, but comfort matters, because you’re more likely to stick with side sleeping if your body feels supported. Here are practical, non-medical ways people make it easier—especially once you hit that “aim for side sleeping” stage in late pregnancy.

Pillows that help

You don’t need anything fancy. The goal is to keep your spine from twisting and to support your belly/hips so you’re not straining overnight.

Common “works-for-most-people” options include:

• A pillow between your knees to keep your hips from pulling out of alignment.
• A body pillow or long pillow to hug while you sleep on your side.
• A pillow under your belly if you feel pressure when lying on your side.

Mattress comfort counts

If your mattress is too soft, you may sink in and feel uncomfortable. If it’s too firm, you may get pressure on your hips. Even without changing your mattress, you can often help by adding support under you (like a thicker mattress topper if you have one) or by rearranging pillows to fill the gaps.

Don’t forget daytime naps

The SERP theme explicitly includes both:

• night sleep
• daytime naps

If you can’t stay side-sleeping all day, aim for “most of the time,” and treat naps like mini test runs. Many people find it easier to keep the habit once they start napping on their side too.

When should you stop sleeping on your back when pregnant (practical switching guidance)

Instead of a scary “stop on this exact day” rule, the SERP messages point you toward a schedule.

Here’s the practical version that matches the snippets:

• Start shifting your plan in the lead-up to the third trimester.
• Around 28 weeks, make side sleeping your goal (with the idea that it’s safer than back sleeping as you get closer to the end of pregnancy).
• In the third trimester, go to sleep on your side—for both nights and naps.

You’ll also see that the SERP includes a balancing point about back or side sleeping through the 30th week not appearing to increase certain risks. But if you’re trying to do the “safer direction” move, the timeline still makes sense:

• Aim to stop making your back position the default once you’re around 28 weeks / in the third trimester.

And of course, your clinician’s advice should steer your exact plan.

What to do if you wake up on your back: simple reset steps

Waking up on your back is super common. Bodies roll in the night, especially as pregnancy changes your comfort.

Here’s an easy “reset” routine you can use without getting stressed:

1. Don’t panic. If you’re in the third trimester, the goal is better odds over time, not perfection in one night.
2. Get comfortable first. If you feel any discomfort, switch to a position that feels better right away.
3. Use pillows to make side sleeping easier.

• Add a pillow between your knees.
• Use a body pillow to help you stay on your side.

1. Choose your target side.

• If you can, try left side since the SERP highlights it for blood flow to the placenta.

1. Restart your sleep plan.

• Once you’ve adjusted, settle back down on your side and let your body do the rest.

If you keep waking on your back even with pillows, that’s still okay. Just keep using the pillow setup that helps you return to your side whenever you notice.

If you’re adjusting sleep comfort, check our practical tips on making side sleeping easier with supportive setup ideas.