Sleep apnea is when you stop breathing repeatedly during sleep

Sleep apnea is a condition where your breathing stops and starts many times while you sleep. These pauses can last from a few seconds to more than a minute, and they happen without you being aware of them. Your brain usually wakes you just enough to restart your breathing, but often so briefly that you don't remember it the next morning. Over a single night, these interruptions can happen dozens of times or even hundreds of times, depending on how severe the condition is.

When your breathing stops, the oxygen level in your blood drops. Your heart has to work harder to pump that oxygen-depleted blood through your body. Over time, this strain can lead to high blood pressure, heart problems, and stroke. Sleep apnea also prevents you from getting the deep, restorative sleep your body needs, which is why people with untreated sleep apnea often feel exhausted during the day.

Key Takeaways

  • Sleep apnea causes repeated breathing pauses during sleep, sometimes lasting over a minute each.
  • The most common type is obstructive sleep apnea, where throat muscles relax and block the airway.
  • Loud snoring, gasping for air, and daytime sleepiness are the main warning signs.
  • A sleep study is the standard way doctors diagnose sleep apnea and measure how often it occurs.
  • Untreated sleep apnea increases your risk of heart attack, stroke, and high blood pressure.

The two main types of sleep apnea

Obstructive sleep apnea (OSA) is by far the most common type. It happens when the muscles in your throat relax during sleep and partially or completely block your airway. Your diaphragm—the muscle below your lungs that controls breathing—works harder to pull air through the blockage, which often creates a loud snort or gasp that wakes you. People who are overweight, have a thick neck, or have a recessed chin are at higher risk, though anyone can develop OSA.

Central sleep apnea is less common. It occurs when your brain fails to send the signal to your breathing muscles to breathe. Unlike obstructive sleep apnea, there is no physical blockage—the problem is a communication breakdown between your brain and your lungs. Central sleep apnea is often linked to heart failure, stroke, or other neurological conditions. Some people have both types at the same time, a combination called mixed sleep apnea.

Symptoms you might notice or someone else might tell you about

The most obvious sign is loud snoring, especially snoring that stops abruptly followed by gasping or choking sounds. Not everyone who snores has sleep apnea, but loud snoring paired with other symptoms is a strong warning sign. You might also notice that you gasp for air or choke during sleep—usually your bed partner will notice this before you do, since the awakening is often too brief for you to remember.

Daytime sleepiness is one of the most common complaints. You might fall asleep at red lights, during meetings, or while reading, even though you spent eight hours in bed. This happens because your sleep was fragmented by all those breathing pauses. You may also wake up with a dry mouth or sore throat, have morning headaches, or feel irritable and have trouble concentrating during the day.

Some people report restless sleep, frequent tossing and turning, or waking up multiple times during the night without knowing why. Others notice they need to urinate several times during the night. In children, sleep apnea can show up as hyperactivity, poor school performance, or behavioral problems rather than sleepiness.

Who is at higher risk for sleep apnea

Sleep apnea is more common in men than women, though women's risk increases after menopause. Being overweight or obese is the single largest risk factor for obstructive sleep apnea, because extra tissue in the neck and throat can narrow the airway. A thick neck (over 17 inches in men, over 16 inches in women) is associated with higher risk.

Age matters too—sleep apnea becomes more common as you get older, though it can occur at any age, including in children. Other risk factors include having a family history of sleep apnea, smoking, drinking alcohol (especially close to bedtime), using sedative medications, and having a recessed chin or overbite. People with high blood pressure, heart disease, or stroke history are also at increased risk.

How doctors diagnose sleep apnea

Your doctor will start by asking about your symptoms, your sleep habits, and whether anyone has told you that you snore or stop breathing during sleep. They may ask you to fill out a questionnaire like the Epworth Sleepiness Scale, which rates how likely you are to doze off in different situations. A physical exam will include checking your throat, neck, and airway for any obvious blockages.

The definitive diagnosis comes from a sleep study, also called a polysomnography. This can be done in a sleep lab where you spend a night hooked up to sensors that measure your brain waves, heart rate, oxygen level, breathing effort, and leg movements. The sensors are painless and non-invasive. Some people do a home sleep apnea test instead, which is simpler but less detailed—you wear a small portable device that measures breathing, oxygen, and heart rate while you sleep at home.

During the sleep study, technicians count how many times per hour your breathing stops (called the apnea-hypopnea index, or AHI). An AHI of 5 to 15 is considered mild, 15 to 30 is moderate, and over 30 is severe. The study also shows how much your oxygen level drops during each pause and how often you wake up.

What happens to your body during a breathing pause

When your airway closes or your brain fails to signal your lungs to breathe, oxygen stops flowing in. Within seconds, the oxygen level in your blood begins to drop. Your brain detects this drop and sends an emergency signal that partially wakes you—usually so briefly you won't remember it. This arousal causes your muscles to tense, your airway to open, and breathing to resume, often with a gasp or snort.

Then the cycle repeats. You fall back asleep, your throat muscles relax again, and the airway closes once more. This can happen 30, 50, or even 100 times per hour in severe cases. Each cycle prevents you from reaching deep sleep stages where your body repairs itself and consolidates memories. Over weeks and months, this repeated oxygen deprivation and sleep fragmentation can damage your heart, blood vessels, and brain.

Why untreated sleep apnea matters

Sleep apnea is not just about feeling tired. The repeated drops in oxygen and the strain on your heart increase your risk of high blood pressure, irregular heartbeat, heart attack, and stroke. Studies show that people with untreated sleep apnea have significantly higher rates of these conditions than people without sleep apnea. The risk is highest in people with moderate to severe sleep apnea.

Beyond heart and stroke risk, untreated sleep apnea can worsen diabetes control, increase the risk of accidents (because of daytime sleepiness), and contribute to depression and anxiety. It can also strain relationships when a bed partner is kept awake by snoring or gasping sounds. The good news is that treatment is available and effective, and many of these risks drop significantly once you start treatment.

Frequently Asked Questions

Can you have sleep apnea without snoring?

Yes. While snoring is common in obstructive sleep apnea, some people have sleep apnea without snoring at all, especially those with central sleep apnea. Daytime sleepiness, morning headaches, and gasping awake are signs even without snoring. If you have these symptoms, mention them to your doctor.

Is sleep apnea the same as just snoring?

No. Snoring is the sound of air vibrating through a partially blocked airway, but it does not necessarily mean your breathing is stopping. Many people snore without having sleep apnea. However, loud snoring combined with gasping, choking, or daytime sleepiness suggests sleep apnea and warrants a conversation with your doctor.

Can children have sleep apnea?

Yes. Children can develop obstructive sleep apnea, often due to enlarged tonsils or adenoids. Signs in children include snoring, restless sleep, mouth breathing, and behavioral or learning problems. If you notice these signs, talk to your child's doctor about a sleep study.

Does sleep apnea go away on its own?

Sleep apnea does not go away without treatment. However, some cases improve with lifestyle changes like weight loss or quitting smoking. Most people need ongoing treatment to manage the condition and prevent complications. Your doctor can discuss which approach is right for you.

What should I do if I think I have sleep apnea?

Schedule an appointment with your primary care doctor and describe your symptoms—snoring, gasping, daytime sleepiness, or morning headaches. Your doctor can refer you to a sleep specialist if needed and order a sleep study. Getting diagnosed is the first step toward treatment and better health.