Wondering how to sleep safely during pregnancy? Learn the best positions for each trimester, why side sleeping is recommended, and tips for getting comfortable.

Pregnancy Sleep Positions: What’s Safe and What’s Not for Each Trimester

You are exhausted. You crawl into bed. And then you cannot get comfortable. Your belly is in the way. Your back hurts. Every position feels wrong.

Sleep is hard enough when you are pregnant. But worrying about whether you are sleeping safely adds even more stress.

Here is the good news. For most of pregnancy, your body will tell you if a position is unsafe. But there are some guidelines that can help you rest easier – literally.

Let me walk you through what doctors recommend for each trimester.

First Trimester: Sleep However You Want

In the first trimester, your uterus is still small and well protected by your pelvic bone. You do not need to worry about sleep positions yet.

You can sleep on your back, your stomach, or your side – whatever feels comfortable.

The only challenge in the first trimester is often exhaustion and nausea, not position. If you are struggling with fatigue, check out my article on pregnancy fatigue and how to manage it for tips.

Second Trimester: Start Transitioning to Side Sleeping

By the second trimester, your uterus has grown and is rising out of your pelvis. This is when you should start practicing side sleeping.

Why Side Sleeping?

Sleeping on your side – especially your left side – improves blood flow to your heart, uterus, and baby. It also helps your kidneys eliminate waste and fluids, which reduces swelling.

The American College of Obstetricians and Gynecologists (ACOG) recommends side sleeping in the second and third trimesters. Left side is ideal, but right side is also safe.

How to Transition

If you are a back or stomach sleeper, start training yourself now. Use pillows to block yourself from rolling onto your back. Place a pillow behind your back and another between your knees.

Third Trimester: Side Sleeping Only

In the third trimester, sleeping on your back can cause problems. Your heavy uterus can press on the inferior vena cava – the large vein that carries blood from your lower body to your heart. This can make you feel dizzy, short of breath, or cause your blood pressure to drop.

Sleeping on your stomach is no longer possible (or comfortable) at this stage.

Left Side Is Best, Right Side Is Fine

Left side sleeping maximizes blood flow. But if you wake up on your right side, do not panic. Just roll back to your left. Your body will likely wake you up if something is wrong – you might feel lightheaded or nauseous.

Can You Sleep on Your Back During Pregnancy?

Sleeping on your back is generally safe until about 20 weeks. After that, it is better to avoid it.

Some studies have linked back sleeping in late pregnancy to a slightly higher risk of stillbirth. However, the absolute risk is very low. According to the National Institutes of Health (NIH), the most important thing is to go to sleep on your side. If you wake up on your back, just turn over.

What About Stomach Sleeping?

Stomach sleeping is safe in the first trimester. By the second trimester, your belly will make it uncomfortable or impossible. Do not worry – you will naturally stop because it will not feel good.

If you miss stomach sleeping, try using a pregnancy pillow with a cutout or a donut-shaped pillow to create space for your belly.

How to Get Comfortable Sleeping on Your Side

Side sleeping can be hard if you are not used to it. Here is how to make it work.

Use Pregnancy Pillows

A full-body pregnancy pillow is a game-changer. It supports your back, belly, and knees. You can also use regular pillows:

• Pillow between your knees keeps your hips aligned and reduces lower back pain.
• Pillow behind your back prevents you from rolling onto your back.
• Pillow under your belly supports the weight of your uterus.

Elevate Your Head

If you have heartburn (common in the third trimester), elevate your head with an extra pillow. Gravity helps keep stomach acid down.

Try the “SOS” Position

Sleep on your left side with your knees and hips bent. Place a pillow between your knees and another under your belly. This is the most comfortable and safest position.

What If You Wake Up on Your Back?

Do not panic. Your body will likely wake you up with discomfort before any harm occurs. Simply roll onto your side and go back to sleep.

Many women wake up on their backs multiple times a night. It is normal. Just correct your position and rest.

Tips for Better Sleep During Pregnancy

• Stay hydrated during the day, but cut back on fluids an hour before bed to reduce bathroom trips.
• Avoid spicy or heavy meals close to bedtime to prevent heartburn.
• Use white noise to block out household sounds.
• Keep your bedroom cool – pregnancy makes you run hot.
• Try a warm bath before bed to relax your muscles.

If you are also dealing with pregnancy Swelling, you might find my article on Pregnancy Swelling: 7 Ways to Reduce Edema in Feet and Ankles helpful for additional comfort tips.

When to Call Your Doctor

Call your doctor if you experience:

• Severe shortness of breath while lying down
• Chest pain or racing heart
• Severe dizziness or fainting
• Leg pain or swelling (could be a blood clot)

These can be signs of a more serious condition, not just discomfort.

Frequently Asked Questions

1. Is it safe to sleep on my right side during pregnancy?

Yes. While left side is best, right side is also safe. The most important thing is to avoid sleeping on your back in the third trimester.

2. Can I use a heating pad for back pain at night?

Use a heating pad on a low setting for 15-20 minutes before bed, but do not fall asleep with it on. Remove it before you close your eyes.

3. How many pillows do I really need?

Most pregnant women use 2-3 pillows: one for their head, one between their knees, and one behind their back or under their belly. A pregnancy pillow combines all of these.

4. Will sleeping on my back hurt my baby?

In the third trimester, back sleeping may slightly reduce blood flow. But your body will likely wake you up before any harm occurs. The risk is very low. Still, it is best to train yourself to sleep on your side.

5. What if I cannot sleep at all during pregnancy?

Insomnia is common. Talk to your doctor. They may recommend safe sleep aids or refer you to a sleep specialist. Do not take over-the-counter sleep medications without checking with your provider first.

Conclusion

Sleeping during pregnancy gets harder as your belly grows. But you can stay comfortable and safe by sleeping on your side – left side is best, right side is fine.

Use pillows to support your back, belly, and knees. Do not panic if you wake up on your back. Just roll over.

You are doing great. Rest is hard, but it is also essential. Give yourself permission to use all the pillows you need.

For more pregnancy tips, check out my article on What to Eat When Everything Smells and Tastes Wrong .