Acid Reflux at Night: Why It Happens and What Helps

You get into bed, settle down, and then it starts: a burning feeling behind your breastbone, a sour taste in the back of your throat, maybe a cough that wakes you up at 2 a.m. Reflux that barely bothers you during the day can feel much worse once you lie down.

This article explains why acid reflux tends to flare at night, what nighttime symptoms can look like, the changes that may help you sleep more comfortably, and the warning signs that need a doctor. It sits within the wider physical health guide, and it can help you understand what is going on, but it cannot diagnose the cause of your symptoms.

What is acid reflux?

Acid reflux, also called gastroesophageal reflux (GER), happens when stomach contents flow back up into the esophagus, the tube that carries food from your mouth to your stomach. The most familiar symptom is heartburn, a burning pain in the middle of the chest.

A ring of muscle called the lower esophageal sphincter normally acts as a one-way valve at the bottom of the esophagus. When it relaxes at the wrong time or does not close fully, acid can escape upward. According to NIDDK, reflux that happens often or causes complications is called gastroesophageal reflux disease (GERD).

If your symptoms mostly hit right after meals rather than at bedtime, the article on heartburn after eating covers that daytime pattern in more detail.

Why is acid reflux worse at night?

Reflux is often worse at night because lying down removes gravity's help in keeping stomach contents where they belong. When you are upright, acid that escapes tends to drain back down. When you are flat, it can pool in the esophagus and stay there longer.

Several other changes happen while you sleep:

• You swallow less. Swallowing and saliva help wash acid out of the esophagus and neutralize it. Both slow down a lot during sleep.
• A full stomach at bedtime. A large or late meal means more stomach contents and more pressure on the valve when you lie down.
• Evening habits add up. Alcohol, a late coffee, chocolate, or a rich dessert in the evening can all relax the valve or irritate the esophagus in some people.
• Your sleeping position. Lying flat, and for some people lying on the right side, may make reflux easier.

Some people also have a hiatal hernia, where part of the stomach pushes up through the diaphragm. MedlinePlus notes that a hiatal hernia can make reflux more likely.

What does nighttime reflux feel like?

Nighttime reflux does not always feel like classic heartburn. Because acid can travel higher when you are lying down, some symptoms show up in the throat, mouth, or chest in ways you might not connect to your stomach.

Symptom	What it may feel like at night
Heartburn	Burning behind the breastbone, often soon after lying down
Regurgitation	Sour or bitter liquid rising into the throat or mouth
Coughing or choking	Waking up coughing, or feeling like you inhaled something
Hoarseness or sore throat	A rough voice or scratchy throat first thing in the morning
Bad taste	A sour taste or bad breath on waking
Broken sleep	Waking several times without knowing exactly why

A cough that lingers for weeks has many possible causes, and reflux is one of them. If yours is worse at night, the guide on a stubborn cough that will not quit may help you sort through the options.

How long before bed should you stop eating?

A common recommendation from NIDDK and other health sources is to avoid lying down for about 3 hours after a meal. That gives your stomach time to empty and reduces how much is sitting there when you get into bed.

In practice, that might mean eating dinner a little earlier, keeping late meals smaller, or skipping the bedtime snack. If you get hungry in the evening, a small, plain snack well before bed is usually easier on reflux than a large or rich one.

What can you do to stop acid reflux at night?

Lifestyle changes are the first step NIDDK suggests for reflux, and several of them target nighttime symptoms specifically. Not every change helps every person, so it is worth trying them one at a time and noticing what makes a difference.

Raise the head of your bed

NIDDK suggests raising the head of your bed by 6 to 8 inches. You can do this with sturdy blocks under the bedposts at the head end, or with a foam wedge under your upper body. Stacking extra pillows under your head usually does not work as well, because it bends you at the waist and can add pressure on your stomach.

Try sleeping on your left side

Some studies suggest that lying on the left side is linked to less reflux than lying on the right side or flat on the back. The evidence is limited, but it is an easy change to test.

Watch the evening triggers

Foods and drinks that commonly trigger reflux include alcohol, coffee and other caffeinated drinks, chocolate, peppermint, fatty or fried foods, spicy foods, citrus, and tomato-based foods. Triggers vary from person to person, so a simple food and symptom diary for a couple of weeks can show which ones matter for you.

Loosen up at the waist

Tight belts and waistbands press on the stomach. Comfortable sleepwear may help.

Address weight and smoking

According to NIDDK, losing weight if you are overweight and quitting smoking can both help reduce reflux symptoms. Smoking weakens the valve and reduces saliva.

Change	Why it may help at night
Eat dinner at least 3 hours before bed	Less food in the stomach when you lie down
Raise the head of the bed 6 to 8 inches	Gravity helps keep acid down while you sleep
Sleep on your left side	May reduce how often acid escapes
Limit alcohol, caffeine, and rich food in the evening	Fewer things relaxing the valve or irritating the esophagus
Smaller evening meals	Less pressure on the valve
Quit smoking	Smoking weakens the valve and reduces protective saliva

Which medicines help with nighttime heartburn?

Several types of over-the-counter medicine can ease reflux, and they work in different ways. Read the label, follow the directions, and talk to your pharmacist or doctor if you take other medications or have ongoing health conditions.

• Antacids neutralize acid that is already there and work quickly, but the relief is short.
• H2 blockers reduce how much acid your stomach makes. Taken before a meal or at bedtime, they may help prevent symptoms for several hours.
• Proton pump inhibitors (PPIs) lower acid production more strongly. Over-the-counter PPIs are labeled for a 14-day course for frequent heartburn, and the label advises talking to your doctor before using them longer or more often.

If you find yourself reaching for heartburn medicine most nights, or symptoms come back as soon as you stop, that is a reason to see your doctor rather than keep treating it on your own. Some medications, including certain pain relievers, can also irritate the esophagus or stomach, so mention everything you take.

Can nighttime reflux cause long-term problems?

Yes, frequent reflux over a long period can lead to complications, which is one reason ongoing nighttime symptoms are worth checking out. NIDDK lists complications of GERD that include esophagitis (inflammation of the esophagus), narrowing of the esophagus called a stricture, and Barrett's esophagus.

Barrett's esophagus is a condition in which the lining of the esophagus changes after long exposure to acid. MedlinePlus notes that it raises the risk of a type of esophageal cancer, although most people with Barrett's never develop cancer.

Reflux that keeps waking you up also takes a toll on sleep itself. Poor sleep over weeks can leave you foggy and drained. If tiredness has become your normal, the article on why you feel tired all the time looks at other possible causes too.

Is it heartburn or something more serious?

Chest discomfort at night is usually reflux, but not always, and heart problems can feel similar. Heartburn tends to burn, rise toward the throat, follow meals or lying down, and ease with antacids. Heart-related pain is more often described as pressure, squeezing, or fullness, and it may spread to the arm, back, neck, or jaw.

When in doubt, treat chest pain as an emergency. The article on pain under the right rib covers other upper-abdominal causes, but it is not a substitute for urgent care when the warning signs below are present.

When should you see a doctor or call 911?

Talk to your doctor if you have heartburn or reflux more than twice a week, if symptoms keep waking you up, or if over-the-counter medicine is not helping or you need it most days. Your primary care provider may recommend prescription treatment or refer you to a gastroenterologist, a specialist in the digestive system, who may suggest tests such as an upper endoscopy.

See a doctor promptly if you notice:

• Trouble swallowing or pain when swallowing.
• Food that feels stuck in your chest or throat.
• Weight loss you cannot explain.
• Ongoing hoarseness, wheezing, or a chronic cough.
• Symptoms that started after age 60 or have changed in pattern.

Call 911 or go to the emergency room if you have:

• Chest pain or pressure, especially with shortness of breath, sweating, nausea, lightheadedness, or pain spreading to the arm, back, neck, or jaw. These can be signs of a heart attack.
• Vomiting blood or material that looks like coffee grounds.
• Black, tarry, or bloody stools.
• Choking or trouble breathing after waking with reflux.