You've had dinner, you've wound down, you've finally got into bed. Four minutes later there's a burning line running up your chest into your throat.
The timing is what makes pregnancy heartburn so infuriating. You were fine all evening. You lie down and it starts.
Pregnancy, Birth and Baby puts the odds at about 8 in 10 that you'll get indigestion or heartburn at some point in a pregnancy. So this isn't something you've brought on yourself.
We'll say this plainly, because it's true: no maternity product makes reflux go away. What follows is what actually helps, and the point at which it's worth asking for medication instead of soldiering on.
Why lying down is the trigger
We're not clinicians, so here's the short version with the source attached.
Pregnancy, Birth and Baby explains that indigestion and heartburn are common in pregnancy because of hormonal changes and your uterus pressing up against your stomach. Two things going on at once.
The valve is relaxed. Progesterone relaxes smooth muscle all over your body, which is necessary for your uterus and inconvenient for the ring of muscle at the top of your stomach that normally keeps acid where it belongs.
And gravity stops helping. Pregnancy Birth and Baby make this point directly: food is only held in your stomach by gravity, which is why lying down after a big meal is such a reliable way to bring it back up. Standing and sitting keep acid pooled at the bottom. Lying flat puts it right up against a valve that isn't sealing properly.
Add a stomach that's being crowded from below and digestion that's running slower than usual, and bedtime becomes the worst part of the day.
What actually helps
Stop eating earlier than feels reasonable
Two to three hours between your last mouthful and lying down. This is the single highest-impact change and also the most annoying one, because it means dinner at 6:30pm and no bedtime toast.
Smaller meals, more often
Five or six small ones rather than three large. A very full stomach is a stomach that pushes upward.
Work out your own triggers
The usual suspects are spicy food, citrus, tomato, fried and fatty food, chocolate and caffeine. Yours may not be on that list. A few notes on your phone for a week will tell you more than any article.
Drink between meals, not during
Large volumes of liquid with dinner distend your stomach. Sip through the day instead, and keep the evening glass small.
Prop your whole upper body, not your head
Stacking pillows under your head bends your neck and does nothing useful. You want your torso raised by 10 to 15cm so your oesophagus sits above your stomach. A wedge under the mattress, or blocks under the head of the bed frame, works better than pillows.
Lie on your left
Your stomach curves to the left, so left-side lying tends to keep the junction with your oesophagus above the acid line. Plenty of women find it makes a noticeable difference. From 28 weeks you'll be side-sleeping anyway.
Nothing tight across your stomach
Anything with a firm band sitting on a full stomach adds pressure in exactly the wrong direction. Loose sleepwear is worth having on hand.
When to stop white-knuckling it and ask for medication
There's a bit of a martyr culture around pregnancy heartburn, as though putting up with it is the responsible option. It isn't.
Pregnancy, Birth and Baby notes there are medicines to control indigestion and heartburn, and to see your doctor if symptoms don't improve. Antacids and alginates are commonly used in pregnancy, and if lifestyle changes aren't cutting it, that's the conversation to have.
Two things worth knowing before you self-prescribe from the chemist shelf:
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Check with your midwife, GP or pharmacist first, and tell them you're pregnant. Some preparations aren't suitable, and some contain more sodium or aluminium than you'd want.
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Antacids can block iron and folic acid absorption. Don't take them within a couple of hours of your supplements. This one catches a lot of people out.
If you want a midwife's perspective on managing the physical stuff rather than enduring it, Lauren at One Mama Midwife covers a lot of this ground.
Worth a call rather than waiting
Ring your midwife or GP if you have severe or persistent pain, trouble swallowing, you're vomiting, or you're losing weight. And if you ever get upper abdominal pain along with a headache, visual changes or swelling, call the same day, because that combination needs ruling out properly rather than being filed under heartburn.
The short version
Heartburn that arrives when you lie down is a relaxed valve plus the loss of gravity, on top of a crowded stomach. Eat earlier, eat smaller, raise your whole torso, lie on your left. And if that isn't enough, ask about medication rather than putting up with it for three more months.
For the wider picture on late-pregnancy nights, we've written about pregnancy insomnia and about foods that support better sleep.
Frequently Asked Questions
Does milk before bed help?
For some women a small glass of milk buffers the acid briefly. For others the fat and protein prompt more acid production half an hour later. Try it once and see which camp you're in.
Does bad heartburn mean a baby with lots of hair?
There's one small study that found an association, which is more than most old wives' tales manage, but it's a single study of a small group and it doesn't predict anything about your baby. Plenty of very hairy newborns arrive to mothers who never had a day of reflux.
Will it go once I've given birth?
For most women it eases quickly after birth, as the pressure comes off and hormone levels drop. If it's still bothering you weeks later, that's worth mentioning to your GP, since it may not have been pregnancy heartburn.
Can I take antacids while pregnant?
Many are used in pregnancy, but check with your midwife, GP or pharmacist before starting anything, and keep them a couple of hours away from your iron and folic acid.
The information in this article is general in nature and intended as comfort support only. It is not medical advice. Always consult your midwife, GP, or a qualified healthcare provider for guidance specific to your situation.
