Heartburn at Night in Pregnancy: What Helps, When to Call

Heartburn at night in pregnancy is common, and lying down is a big part of why. Pregnancy hormones relax the valve between your stomach and your food pipe, and the baby presses on your stomach from below. The fixes that help most are dull ones. Finish eating about three hours before bed. Raise your head and shoulders on a slope that starts at your waist, not on a pile of pillows under your neck. Try sleeping on your left side. If none of that is enough, ask your midwife, doctor or pharmacist what’s safe to take. Heartburn that won’t go away, or pain under your ribs, is a call, not a cope.

Where this post stops

I’m not a doctor or a midwife. I’m pregnant with my second, and this is the “is this normal-ish?” version, built from NHS, ACOG and CDC pages I read in October 2026. If anything in the “when to call” section fits, skip the rest and call.

Why it gets worse when you lie down

The NHS’s indigestion and heartburn in pregnancy page gives three reasons it’s more likely now: hormonal changes, “the growing baby pressing on your stomach”, and the muscles between your stomach and gullet relaxing, “allowing stomach acid to come back up”. Symptoms can start at any point, but they’re “more common from 12 weeks onwards”.

Night is when gravity stops helping. ACOG’s digestive problems FAQ says acid reflux “may become more frequent while lying down” and “happens more often during pregnancy”. The NHS’s general heartburn page says symptoms are often worse “after eating, when lying down and when bending over”. A late dinner followed by bed hits two of those three. Betteroo’s 30-week rundown notes that heartburn is often worse at night.

One for the second-timers: the NHS lists “you’ve been pregnant before” and “you’re in the later stages of pregnancy” among the things that make it more likely. So if round two is burning earlier than round one did, that’s on the list. (The rest of what’s different this time is in second pregnancy differences.)

The earlier-dinner fix

This is the change that does the most, and it’s mostly about timing.

Leave about three hours. The NHS pregnancy page says to “not eat within 3 hours of going to bed at night”. The general heartburn page says 3 or 4 hours. With a 10pm bedtime, that’s dinner done by 7pm.
Eat smaller meals more often. The NHS suggests “small meals often, rather than larger meals 3 times a day”. It also says you’re more likely to get indigestion “if you’re very full”.
Sit up through dinner and after it. The NHS says to sit up straight while you eat and just after, which “will take the pressure off your stomach”. ACOG says to avoid lying on your back right after eating. So no collapsing on the sofa at 7:15.
Know your triggers. The NHS pregnancy page names caffeine drinks and food that’s “rich, spicy or fatty”. ACOG adds citrus fruit, tomatoes and fried foods. Watch which ones show up in your 2am burning, and move those to lunch.
Loosen your waistband. The general NHS page says not to wear clothes that are tight around your waist.

The toddler version of this is easier than it sounds. If your first child eats at 5:30, eat with them, and save the late snack for the nights the heartburn has been quiet.

Propped pillows, done properly

The NHS pregnancy page says “propping your head and shoulders up when you go to bed can stop stomach acid coming up while you sleep.” The general NHS page adds a catch. It suggests raising the head of the bed by around 10 to 20cm, “so your chest and head are above your waist”. Then it warns against getting the same effect from extra pillows, because that “can increase pressure on your belly and make your symptoms worse”.

So the goal is a slope that starts at your waist. A tower of pillows bends you at the middle and squashes the bump into your stomach, which is the problem you were trying to fix.

Two ways to build the slope:

Raise the head of the bed. The NHS mentions using wood, bricks or books under the head end. Use something flat and solid, check the bed doesn’t rock, and get someone else to lift it.
Use a wedge that starts at your waist. A plain foam wedge works if it’s long enough to start at your hips. Most are built for sleeping on your back, though, and late pregnancy is side-sleeping time. A setup designed for an incline on your side, like the MedCline Reflux Relief System, is the worked example. It’s a wedge plus a body pillow with a pocket for your lower arm. It’s big and it’s a splurge. Raising the bed head is the free version.

Then the side. The NHS pregnancy page says “sleeping on your left side can also help”. Your existing side-sleeping setup carries over to the slope: something under the bump, something between the knees, and something behind your back. The full arrangement is in how to sleep when pregnant.

Up at 2am with heartburn? Use it to plan the newborn nights Betteroo turns a two-minute quiz into a day-by-day newborn sleep plan that adjusts as your baby changes. Take it while you're still pregnant, and the plan is waiting before the first night home. Take the 2-minute sleep quiz →

When it wakes you anyway

Some nights it’ll get through anyway. Sit up rather than lying flat and stewing, since lying down is what makes it worse, and stay propped for a while before you try sleeping again.

Don’t start working through the bathroom cabinet. The NHS says some heartburn medicines are safe to take in pregnancy and some are not suitable, and its advice is to tell the pharmacist you’re pregnant. So the question for your midwife, doctor or pharmacist is “what’s safe for me, and when should I take it?”, and it’s best asked in daylight, before the 2am version of you has to decide. If you take anything else they’ve prescribed, ask whether the two go together.

When to call your OB or midwife

Get medical care right away if you have chest pain, a fast-beating heart or trouble breathing. All three are on the CDC’s urgent maternal warning signs, with the instruction to “seek medical care immediately”. Don’t decide at home that it’s probably heartburn.

Call your maternity unit, OB or midwife urgently if you have:

pain below your ribs, or in your upper belly or shoulder
heartburn that doesn’t go away with the heartburn medicine you’ve been told is safe
a severe headache, blurred vision or flashing lights, sudden swelling of the face, hands or feet, or vomiting

These are signs of pre-eclampsia. The NHS pre-eclampsia page says they “need to be checked immediately” and that it’s most likely from 20 weeks. ACOG’s preeclampsia FAQ lists “pain in the upper abdomen or shoulder” and says to call “right away”, especially in the second half of pregnancy. Because the NHS lists heartburn among the symptoms, the two are easy to confuse. If you’re not sure which you have, call.

Mention it at your next visit, or call sooner, if the diet and sleep changes aren’t working, or if you have any of the other signs the NHS pregnancy page lists:

difficulty swallowing
a hoarse voice
a cough that doesn’t get better or keeps coming back
swollen glands on each side of your neck
weight loss
pain or swelling in your stomach

FAQ: heartburn at night in pregnancy

When does heartburn start in pregnancy?

The NHS says you can get it at any point, but it’s “more common from 12 weeks onwards”, and more likely in the later stages. The last month of pregnancy is often when it’s worst at night.

Which side should I sleep on for heartburn?

The NHS pregnancy page says sleeping on your left side can help. Side-sleeping is the late-pregnancy advice anyway, so start on the left and switch when your hip complains.

Can I just stack more pillows?

Not under your head alone. The general NHS heartburn page says extra pillows can increase pressure on your belly and make symptoms worse. Raise your whole upper body from the waist instead.

Will it ease after the birth?

None of the pages I read promises that. The nights won’t suddenly get quiet either way. Betteroo builds a newborn sleep plan from a short quiz, for about $20 a month, so you can do that planning now. It’s a planning tool, not medical advice.