What Is Sleep Apnea?
Sleep apnea is a sleep disorder characterized by repeated interruptions in breathing during sleep. These pauses — called apneas — can last from a few seconds to over a minute and may occur dozens or even hundreds of times per night. Each interruption briefly rouses the brain from deep sleep, severely fragmenting sleep quality even when the person has no memory of waking up.
It is estimated to be one of the most prevalent sleep disorders globally, yet a significant proportion of cases go undiagnosed — often because sufferers assume their tiredness is simply part of modern life.
Types of Sleep Apnea
| Type | Cause | Common In |
|---|---|---|
| Obstructive Sleep Apnea (OSA) | Physical blockage of the airway by soft tissue | Overweight adults, middle-aged men |
| Central Sleep Apnea (CSA) | Brain fails to signal breathing muscles | People with heart failure, neurological conditions |
| Complex/Mixed Sleep Apnea | Combination of obstructive and central causes | Diagnosed after treatment of OSA |
Obstructive sleep apnea is by far the most common form.
Recognizing the Symptoms
Because apnea events happen during sleep, many people are alerted to the problem by a bed partner. Key symptoms include:
- Loud, chronic snoring (often with gasping or choking sounds)
- Observed pauses in breathing during sleep
- Waking with a dry mouth or sore throat
- Morning headaches
- Excessive daytime sleepiness despite adequate time in bed
- Difficulty concentrating or memory problems
- Irritability, mood changes, or depression
- Frequent nighttime urination (nocturia)
What Causes Obstructive Sleep Apnea?
OSA occurs when the muscles at the back of the throat relax excessively during sleep, causing the airway to narrow or close. Risk factors include:
- Excess weight: Fat deposits around the upper airway can obstruct breathing.
- Neck circumference: A thicker neck may narrow the airway.
- Age: Muscle tone naturally decreases with age.
- Sex: Men are more likely to develop OSA, though the risk for women increases after menopause.
- Anatomy: A narrowed airway, large tonsils, or a small jaw can contribute.
- Alcohol and sedatives: Relax throat muscles and worsen apnea.
- Smoking: Increases inflammation and fluid retention in the airway.
- Family history: Genetic predisposition plays a role.
Health Consequences of Untreated Sleep Apnea
Sleep apnea is far more than a nighttime nuisance. Left untreated, it is associated with a range of serious health risks:
- High blood pressure (hypertension)
- Increased risk of heart disease and stroke
- Type 2 diabetes
- Metabolic syndrome
- Liver problems
- Impaired immune function
- Cognitive decline and increased dementia risk over time
Diagnosis: How Is Sleep Apnea Detected?
The gold standard for diagnosis is a polysomnography (PSG) — an overnight sleep study conducted in a sleep lab where brain activity, breathing, oxygen levels, and heart rate are monitored. Home sleep apnea tests (HSAT) are also available and may be appropriate for certain patients, though they measure fewer variables.
Treatment Options
CPAP Therapy
Continuous Positive Airway Pressure (CPAP) therapy is the most effective and widely used treatment for moderate to severe OSA. A machine delivers a steady stream of pressurized air through a mask, keeping the airway open throughout the night. While it takes adjustment, most people experience dramatic improvement in sleep quality and daytime alertness.
Lifestyle Changes
For mild OSA, meaningful improvements can come from weight loss, reducing alcohol intake, sleeping on your side rather than your back, and quitting smoking.
Oral Appliances
Dental devices that reposition the jaw or tongue can help keep the airway open and are a good alternative for those who cannot tolerate CPAP.
Surgery
In some cases — particularly when anatomical features like large tonsils are the primary cause — surgical intervention may be recommended.
When to See a Doctor
If you regularly wake feeling unrefreshed, experience excessive daytime sleepiness, or have been told you snore loudly or stop breathing during sleep, it's worth discussing a sleep evaluation with your doctor. Sleep apnea is highly treatable, and addressing it can have profound benefits for both your sleep and overall health.