If you wake up short of breath at night, or you can only breathe comfortably by sitting up, the causes these sources name most often are heart conditions such as heart failure, lung conditions such as COPD, and sleep apnea, which is breathing that pauses while you sleep. WebMD says breathlessness that comes on when you lie down, which it calls orthopnea, is almost always caused by a condition such as heart failure or chronic obstructive pulmonary disease (COPD). If the breathlessness is sudden or severe, do not wait for an appointment. Fivestar Pulmonary Associates says to seek immediate emergency care for sudden, unexplained shortness of breath, and to head to the nearest emergency department without delay when it is sudden or severe.
Asking about it is the right move. This page explains the common patterns and what to write down, so your visit is faster and the answer is clearer.
Prepare for an assessment of nighttime breathlessness
Start a short note before your appointment. The British Heart Foundation nurse guidance suggests asking yourself whether your symptoms are new or worse than usual, and how long they have been going on or changing. The table below lists what to write down and why it matters.
| What to note | Why it matters | Source |
|---|---|---|
| How many pillows you need | WebMD says needing multiple pillows to breathe comfortably at night is a reason to see your doctor | WebMD orthopnea guide |
| Whether sitting or standing eases it | This is the pattern WebMD describes for orthopnea | WebMD orthopnea guide |
| Whether you wake after a couple of hours of sleep | WebMD describes paroxysmal nocturnal dyspnea as waking breathless after a couple of hours of sleep, relieved by sitting up | WebMD orthopnea guide |
| Swollen feet or ankles, or sudden weight gain | Both are listed among orthopnea symptoms | WebMD orthopnea guide |
| Loud snoring, gasping, or pauses a partner sees | MedlinePlus says most people with sleep apnea do not know their breathing stops, and a partner often hears it | MedlinePlus overview of obstructive sleep apnea |
| Daytime sleepiness or morning headaches | Listed as sleep apnea signs by MedlinePlus and Gwinnett Pulmonary & Sleep | MedlinePlus; Gwinnett Pulmonary & Sleep |
| Smoking or vaping history | WebMD says COPD often results from many years of smoking; the symptom record matters for that reason | WebMD orthopnea guide |
Your clinician may order X-rays, blood tests, an echocardiogram (a test that uses a handheld wand to picture the heart), pulmonary function tests such as spirometry test, or a sleep study, according to WebMD. Bring your note so the results can be matched to your pattern.
Why do I wake up short of breath at night?
Three patterns come up most often. In orthopnea, WebMD explains that blood shifts from your legs to your chest when you lie down, and a weak heart may not pump it out, so fluid can build up in the lungs. Paroxysmal nocturnal dyspnea (PND) is different: WebMD describes waking breathless after a couple of hours of sleep, and says sitting up relieves it. Sleep apnea works differently again. MedlinePlus explains that the muscles in the throat relax during sleep and can let the airway close, and that some people with it wake up gasping for air.
Johns Hopkins signs of sleep apnea says obstructive sleep apnea can cause a person to stop breathing for 20 to 30 seconds at a time, numerous times through the night. Gwinnett Pulmonary & Sleep notes that some people have these pauses without loud snoring.
What can narrow the airway at night?
Several things can narrow or block the airway during sleep, according to these sources.
| Possible reason | What the source says | Source |
|---|---|---|
| Nasal congestion from allergies or sinus problems | Can block breathing further, especially when lying flat | Gwinnett Pulmonary & Sleep |
| Large tonsils and adenoids | Can block the airway | MedlinePlus |
| Large tongue | May fall back and block the airway | MedlinePlus |
| Sleeping on your back | Can cause the airway to become blocked or narrowed | MedlinePlus |
| Excess weight or large neck size | Listed as sleep apnea risk factors; MedlinePlus gives 17 inches (43 cm) or more for men and 16 inches (41 cm) or more for women | MedlinePlus |
| Smoking | Smoking inflames the airways and increases mucus production | Gwinnett Pulmonary & Sleep |
Anxiety is also named as a cause. The British Heart Foundation says being short of breath can be frightening and can start a cycle of rapid breathing that makes breathlessness worse. It lists anxiety alongside heart and lung conditions. It also describes panic attack symptoms, including a racing heartbeat, feeling faint, and struggling to breathe, and notes that most panic attacks last between 5 and 20 minutes, according to the charity Mind. For more on this, read shortness of breath from anxiety.
Does needing extra pillows matter?
Yes, it is worth reporting. WebMD says that if you find yourself needing multiple pillows to breathe comfortably at night, you should see your doctor, and it lists needing more pillows among orthopnea symptoms. Propping yourself up can help in the short term: WebMD says you may be able to ease symptoms by sitting, standing, or raising your upper body with pillows. The British Heart Foundation suggests finding a comfortable position, such as being propped up in bed when resting or sleeping. Pillows ease the symptom but do not tell you its cause, which is why your pillow count belongs on your note.
How do sleep apnea and heart conditions differ?
Each pattern feels different at night.
| Pattern | What happens at night | Source |
|---|---|---|
| Orthopnea | Breathlessness when lying down that eases when you sit or stand | WebMD orthopnea guide |
| Paroxysmal nocturnal dyspnea | Wakes you after a couple of hours of sleep; sitting up relieves it | WebMD orthopnea guide |
| Sleep apnea | Snoring, pauses, and a snort or gasp as breathing restarts; often noticed first by a bed partner | MedlinePlus overview of obstructive sleep apnea |
WebMD notes that sleep apnea and snoring can also produce orthopnea. Fivestar Pulmonary Associates says shortness of breath that happens at night, called paroxysmal nocturnal dyspnea, is common with sleep apnea.
Does sleep apnea affect blood pressure?
According to these sources, yes. MedlinePlus says untreated sleep apnea may lead to or worsen heart disease, including high blood pressure, heart arrhythmias, heart failure, heart attack and stroke. Johns Hopkins says untreated apnea can increase the risk of high blood pressure, heart disease, stroke, diabetes and some headache syndromes. MedlinePlus also lists difficult-to-treat high blood pressure among problems that may occur. A sleep study is how sleep apnea is confirmed, and MedlinePlus says it can be done at home or in a sleep lab. MedlinePlus also says CPAP devices work well to treat sleep apnea in most people, and that lifestyle changes may help people with mild sleep apnea.
What if I smoke or vape?
If you smoke or vape, or you have quit and started again, you are in good company. The federal MyHealthfinder quit-smoking page says many people try to quit several times before they succeed, and setbacks are normal. WebMD says COPD often results from many years of smoking, exposure to pollution, or inhaling other toxic materials, and that if you have COPD and smoke, you should quit. Trouble sleeping is one common withdrawal symptom, according to Smokefree.gov, and smoking nicotine and sleep is a related read for quitting.
Can shortness of breath be nothing serious?
Sometimes, yes. Fivestar Pulmonary Associates says breathlessness with an obvious cause, such as running up a flight of stairs, is typically mild, quickly resolves on its own, and is not cause for concern. It also says breathlessness is common during strenuous exercise, at high altitudes, or in extreme heat or poor air quality. What it says is not normal is unexplained breathlessness that appears while you are resting, sitting still or lying in bed. That is the night pattern you are describing, so it deserves a proper check.
Is sudden shortness of breath that goes away quickly serious?
It can be. Fivestar says sudden breathlessness tends to be brief, lasting from a few hours to a few days, and that you should seek immediate emergency care any time you have sudden, unexplained shortness of breath, because it may be a sign of a life-threatening condition. Going away quickly does not make it safe to ignore.
How can I tell if my shortness of breath is serious?
Fivestar says dyspnea is most worrisome when it is sudden or severe, especially when accompanied by chest or shoulder pain, nausea, dizziness, fainting, a fast or irregular heartbeat, or a high fever, and that immediate emergency care is vital in those cases. Not being able to catch your breath at all, still feeling breathless after 30 minutes of rest, stridor or wheezing, blue nails, lips or skin, or swollen ankles and feet call for prompt emergency care:
- Chest or shoulder pain, nausea, dizziness, or fainting
- A fast or irregular heartbeat, or a high fever
- Not being able to catch your breath at all
- Still feeling breathless after 30 minutes of rest
- High-pitched (stridor) or whistling (wheezing) sounds when you breathe in
- Blue nails, lips, or skin
- Swollen ankles and feet
If shortness of breath is sudden or severe and comes with chest or shoulder pain, nausea, dizziness, fainting, a fast or irregular heartbeat, or a high fever, Fivestar says immediate emergency care is vital; go to the nearest emergency department without delay. If you cannot catch your breath at all, are still breathless after 30 minutes of rest, have blue nails, lips or skin, or have swollen ankles and feet, seek prompt emergency care (Fivestar Pulmonary Associates). Fivestar also says persistent or worsening breathlessness needs expert evaluation, and advises against a wait-and-see approach.
How long is too long to have shortness of breath?
The pattern matters more than a set number of days. Fivestar says acute breathlessness usually lasts from a few hours to a few days, while chronic breathlessness builds slowly over several weeks or longer and may come and go. The British Heart Foundation advises that if you have shortness of breath and no diagnosed condition causing it, you should see a doctor to have it investigated. New breathlessness that wakes you at night is worth a visit rather than waiting it out.
How do I know if my shortness of breath is heart-related?
The British Heart Foundation says heart attack, chest pain (angina), heart failure, heart valve disease and some heart rhythm problems such as atrial fibrillation commonly cause breathlessness, because the heart is not moving enough oxygen-rich blood or fluid builds up in the lungs. WebMD adds that orthopnea is usually caused by a heart condition, and lists swollen feet and ankles, sudden weight gain and chest pain among its symptoms. Symptoms alone do not confirm a heart cause; the tests described above are how clinicians check.
How can you tell if shortness of breath is from the lungs?
The British Heart Foundation lists asthma, COPD and chest infections as lung conditions that can make you feel short of breath. WebMD says pulmonary function tests measure how well your lungs work, and that spirometry measures how much air you can take in and how hard you can breathe out. WebMD says that if you have orthopnea you may wheeze or have a dry cough when you lie down, and these go away when you sit or stand. Mention them to your clinician; they do not by themselves show whether the cause is the lungs or the heart. Because the same symptom appears on both the heart and lung lists, testing is how the two are separated. The site’s spirometry for COPD page is a related read. WebMD describes spirometry as a test of how much air you can take in and how hard you can breathe out.
What this guide cannot tell you, and other options
No article can tell you which cause fits your nights. That takes a history, an exam and tests. Johns Hopkins says that for warning signs like these, a doctor will probably recommend a sleep study. Gwinnett Pulmonary & Sleep describes two forms: a full overnight lab test (polysomnography), which it usually recommends when symptoms are complex or another condition may affect breathing, and a simpler home sleep apnea test, which it describes as suitable for adults with a strong likelihood of obstructive sleep apnea and no significant medical complications.
Comfort steps can ease the moment without naming the cause. The British Heart Foundation suggests sitting in a chair or being propped up in bed, taking slow relaxed breaths, planning rest breaks, and opening a window or using a fan. Gwinnett lists avoiding triggers such as smoke, allergens and cold air. For mild sleep apnea, MedlinePlus suggests avoiding alcohol and medicines that make you sleepy before bed, avoiding sleeping on your back, and losing excess weight. If you take any medicines, ask your clinician before changing anything about them.
Your practical next step
Pick one small step this week. Write down how many pillows you use, whether you wake gasping or after a couple of hours, whether sitting up helps, and whether a partner has noticed snoring or pauses. Add when it started and whether it is getting worse. Bring that note to your doctor and ask whether you need a sleep study, an echocardiogram or spirometry. If you smoke or vape, the breathing symptoms after smoking or vaping page is a related read. If breathlessness is sudden or severe, or comes with chest or shoulder pain, nausea, dizziness, fainting, or blue lips, nails, or skin, do not wait: go to the nearest emergency department without delay (Fivestar Pulmonary Associates lists chest or shoulder pain, nausea, dizziness, fainting and blue lips, nails or skin among reasons for emergency care).
By SmokersLung.com Respiratory Health Education Team
This article is for general information purposes only and does not constitute medical advice. Consult your doctor or qualified healthcare provider before making changes to your health routine.