Nobody really prepares you for how difficult sleep can become in the third trimester.
Your belly feels heavier every week. Your hips ache when you turn in bed. You are waking up constantly to pee, and the moment you finally get comfortable, the heartburn starts.
By this stage, you might simply be trying to get through the night feeling halfway rested.
In this guide, we talk about what can make the nights feel a little easier.
The best sleeping position in the third trimester
As your baby grows, sleeping on your stomach becomes nearly impossible, and lying flat on your back can start to feel uncomfortable too. By the third trimester, most doctors and midwives recommend sleeping on your side instead.
In most cases, the best sleeping position in the third trimester is sleeping on your left side. This position improves blood flow to the placenta, supports kidney function, and can help reduce swollen feet during pregnancy by improving circulation and fluid drainage.
With that said, sleeping on your right side is also considered safe. If you wake up on your right side or accidentally roll over during the night, there is no need to panic. The goal is simply to avoid spending long periods flat on your back.
What to do if you wake up on your back
Many moms wake up on their backs at some point during pregnancy. If it happens, just gently shift back onto your side when you notice.
Some mothers find it helpful to place a pillow or rolled towel behind their back before sleeping. It makes rolling over less likely without forcing your body into one position all night.
How to use pillows for better sleep in the third trimester
The right support can make a surprising difference to your sleep quality, especially when your hips, lower back, and belly all ache at once.
Lie on your left side with your usual head pillow and place another pillow between your knees to keep your hips aligned and reduce pressure on your lower back. If your belly feels heavy or unsupported, tuck a small pillow or wedge underneath it.
If heartburn during pregnancy in the third trimester keeps you awake, try raising your upper body slightly with an extra pillow under your shoulders and head. Even a gentle incline can help reduce the burning sensation when lying down.
How to choose a pregnancy pillow
Here are a few pregnancy pillow options you can consider for a comfortable night’s sleep:
1. U-shaped pillow: Wraps around the front and back of your body for full support. Helpful for moms who shift positions often during sleep, though it can take up a lot of bed space.
2. C-shaped or J-shaped pillow: Offers full-body support while taking up less room than a U-shaped pillow. This can be a good balance between comfort and practicality.
3. Wedge pillow: Small, affordable, and easy to position under the belly or behind the back. Also useful postpartum and convenient for travel.
Managing heartburn so you can sleep more comfortably
Heartburn during pregnancy in the third trimester is extremely common. As your baby grows, your uterus pushes upward against your stomach, making it easier for stomach acid to travel upward.
Pregnancy hormones also relax the muscles that normally keep acid down, which is why the discomfort can suddenly feel much worse at night.
What can help with heartburn
1. Eat smaller meals more often: A very full stomach creates more pressure and makes acid reflux worse. Smaller, more frequent meals are usually easier to tolerate.
2. Try not to eat too close to bedtime: There can be a noticable difference when you stop eating two to three hours before lying down.
3. Pay attention to trigger foods: Spicy food, fried food, chocolate, tomato-based dishes, citrus fruits, and fizzy drinks are common triggers. You are the most familiar with which foods tend to make the discomfort worse. Trust what your body is telling you.
4. Sleep slightly elevated: Raising your upper body slightly with a pillow or wedge can help stop stomach acid from travelling upward while you sleep.
💡 Supermom tip: Try drinking a small cup of warm barley water. It is gentle, hydrating, and often used for digestive discomfort during pregnancy.
If the heartburn becomes severe or starts affecting your ability to eat and sleep regularly, speak to your doctor or pharmacist about pregnancy-safe antacids.
Managing frequent urination at night
The constant overnight bathroom trips can feel genuinely exhausting, especially once your baby’s head starts pressing lower against your bladder in the third trimester.
You probably cannot avoid them completely. But a few small habits can make them less disruptive.
1. Drink more fluids earlier in the day: Try to stay well hydrated throughout the day and reduce fluids slightly in the two hours before bedtime. Do not cut back on water overall. Your body still needs it.
2. Keep the room dim during bathroom trips: Bright lights signal to your brain that it is time to wake up fully. A small nightlight usually works much better than switching on the main bathroom light.
3. Go to the bathroom before getting into bed: Even if you do not urgently need to go, making one final bathroom trip part of your bedtime routine can sometimes help you sleep a little longer before waking again.
Managing swollen feet, body aches, and third trimester heaviness
Swollen feet during pregnancy are especially common by evening in the third trimester.
Your body is carrying extra blood volume, extra fluid, a growing baby, and the physical demands of late pregnancy all at once.
For general discomfort, these small habits often help:
• Sleep with a pillow between your knees to reduce pressure on your hips and lower back
• Avoid sitting or standing in one position for too long Take short walks throughout the day to encourage circulation
• Stretch your ankles and flex your feet regularly if you sit for long periods
• Take a warm shower before bed to ease muscle tension
• Avoid very hot showers or soaking your feet in very hot water for long periods, as heat can sometimes worsen swelling.
Fatigue and why the third trimester can feel harder than expected
The exhaustion in late pregnancy feels different from first trimester fatigue. Earlier in pregnancy, your body was building an entirely new support system for your baby.
By the third trimester, it is maintaining that system while carrying extra weight, coping with interrupted sleep, and preparing for labour at the same time.
It can also feel isolating as this stage is often presented as exciting and joyful, while the truth is that there are more uncomfortable and emotional moments.
If the final weeks feel physically hard, emotionally draining, or both, it does not mean you are doing pregnancy badly. It means your body is responding honestly to one of the most demanding stages of motherhood.
Rest when you can. Accept help when it is offered. And if the emotional exhaustion starts feeling heavier than the physical discomfort, talk to someone you trust, whether that is your partner, your care provider, or another mother who understands what this stage feels like.
It is okay if the third trimester feels hard
You do not have to enjoy every part of the third trimester to still feel grateful for your pregnancy. The discomforts are real, and they deserve practical support, not just reminders to “rest more” whenever possible.
Sometimes the small adjustments help most. A pillow between your knees. A lighter dinner. A slower evening routine. A more comfortable sleeping position.
None of these things fix everything overnight. But together, they can make the final stretch of pregnancy feel a little gentler on your body and a little easier to get through.
