Sleep Apnea

Overview

Sleep apnea is a common but serious sleep disorder in which breathing repeatedly stops and starts during sleep. The most common type, obstructive sleep apnea (OSA), occurs when the muscles in the back of the throat relax too much during sleep, causing the airway to narrow or close. Each pause in breathing (called an apnea) can last 10 seconds or longer and may occur dozens or even hundreds of times per night, disrupting normal sleep patterns and reducing oxygen levels in the blood.

Central sleep apnea, a less common form, occurs when the brain fails to send proper signals to the muscles that control breathing. Some people have complex (mixed) sleep apnea, which combines features of both types. Regardless of the type, untreated sleep apnea prevents restful sleep and places significant stress on the cardiovascular system.

Sleep apnea affects an estimated 22 million Americans, and many cases remain undiagnosed. It is more common in men, people who are overweight, and those over 40, though it can affect anyone — including children. Beyond causing daytime sleepiness and fatigue, untreated sleep apnea significantly increases the risk of high blood pressure, heart disease, stroke, type 2 diabetes, and depression. The good news is that effective treatments — especially continuous positive airway pressure (CPAP) therapy — can eliminate symptoms and reduce health risks.

Symptoms

Recognizing the symptoms of sleep apnea early can lead to faster diagnosis and better outcomes.

Early Symptoms

• Loud, chronic snoring (often noticed by a bed partner)
• Excessive daytime sleepiness or fatigue
• Waking up with a dry mouth or sore throat
• Morning headaches

Advanced Symptoms

• Observed episodes of stopped breathing during sleep
• Gasping or choking sounds during sleep
• Difficulty concentrating and memory problems during the day
• Irritability, mood swings, and depression
• Frequent nighttime urination (nocturia)
• Decreased libido or sexual dysfunction
• Insomnia or restless sleep

Causes & Risk Factors

Common Causes

• Relaxation of throat muscles during sleep, causing airway collapse (obstructive type)
• Excess tissue in the airway due to obesity or enlarged tonsils/adenoids
• Structural features: large tongue, recessed jaw, narrow airway
• Brain signal disruption — failure to signal breathing muscles (central type)
• Nasal congestion or obstruction

Risk Factors

• Obesity — the single greatest risk factor for obstructive sleep apnea
• Large neck circumference (over 17 inches in men, 16 inches in women)
• Being male (2-3 times more likely than women, though risk equalizes after menopause)
• Age over 40
• Family history of sleep apnea
• Smoking
• Alcohol use (relaxes throat muscles)
• Use of sedatives or tranquilizers
• Nasal congestion from allergies or structural issues

How It's Diagnosed

If your doctor suspects sleep apnea based on your symptoms and risk factors, they will likely order a sleep study. The gold standard is an in-lab polysomnography (PSG) — an overnight test in a sleep center where sensors monitor your brain waves, blood oxygen levels, heart rate, breathing patterns, and body movements during sleep. This test provides a detailed picture of your sleep architecture and can precisely count the number of apnea and hypopnea events per hour (the Apnea-Hypopnea Index, or AHI).

For many patients, a home sleep apnea test (HSAT) is a convenient alternative. This simplified test uses a portable device that monitors airflow, breathing effort, and blood oxygen levels while you sleep at home. While less comprehensive than in-lab testing, home tests are effective for diagnosing moderate to severe obstructive sleep apnea. If the home test is inconclusive or central sleep apnea is suspected, an in-lab study will be recommended.

Treatment Options

Lifestyle Changes

• Lose weight — even a 10% weight loss can significantly reduce apnea severity
• Sleep on your side instead of your back (positional therapy)
• Avoid alcohol, sedatives, and sleeping pills, especially before bed
• Quit smoking
• Exercise regularly — improves sleep quality and may reduce apnea independent of weight loss
• Treat nasal allergies to improve airflow

Medications

• There are no medications that effectively treat obstructive sleep apnea directly
• Modafinil or armodafinil may be prescribed for residual daytime sleepiness despite CPAP use
• Medications for central sleep apnea may include acetazolamide in specific cases

Medical Procedures

• CPAP (Continuous Positive Airway Pressure) — the primary treatment; delivers pressurized air through a mask to keep the airway open
• BiPAP (Bilevel Positive Airway Pressure) — provides different pressures for inhaling and exhaling
• Oral appliance therapy — custom-fitted dental device repositions the jaw forward to open the airway
• Uvulopalatopharyngoplasty (UPPP) — surgery to remove excess tissue from the throat
• Maxillomandibular advancement — surgical repositioning of the jaw
• Hypoglossal nerve stimulation (Inspire device) — implanted device stimulates the tongue to keep the airway open

Complementary Approaches

• Myofunctional therapy — exercises to strengthen tongue and throat muscles
• Positional therapy devices — wearable devices that prevent back sleeping
• Didgeridoo playing — studies show it can strengthen upper airway muscles and reduce apnea severity

Living With Sleep Apnea

Adjusting to CPAP therapy is the biggest challenge for many people with sleep apnea, but it's also the most transformative. While the mask and machine take getting used to, most people who stick with CPAP for a few weeks notice dramatic improvements in energy, mood, and mental clarity. Modern CPAP machines are quiet, compact, and offer features like heated humidifiers, auto-adjusting pressure, and comfort settings. Working with your sleep specialist to find the right mask style and pressure settings is crucial — don't give up if the first setup isn't comfortable.

Beyond CPAP, lifestyle changes play an important supporting role. Maintaining a healthy weight, sleeping on your side, and avoiding alcohol before bed all help reduce apnea severity. Regular follow-up with your sleep doctor ensures your treatment remains effective — your pressure needs may change over time, especially with weight changes. Many people are surprised at how much better they feel once their sleep apnea is properly treated. Partners often report improvements too, as snoring decreases dramatically with CPAP use.

Potential Complications

• High blood pressure (hypertension) — sleep apnea is a leading cause of resistant hypertension
• Heart disease, heart attack, and heart failure
• Stroke
• Type 2 diabetes and insulin resistance
• Depression and mood disorders
• Increased risk of motor vehicle accidents from daytime sleepiness
• Cognitive impairment and memory problems
• Liver problems (non-alcoholic fatty liver disease)

Prevention

• Maintain a healthy weight
• Exercise regularly
• Avoid excessive alcohol consumption
• Don't smoke
• Sleep on your side rather than your back
• Treat nasal allergies and congestion promptly

Frequently Asked Questions

Sources

1. Sleep Apnea. Mayo Clinic. View source
2. Sleep Apnea. National Heart, Lung, and Blood Institute. View source
3. Sleep Apnea. Sleep Foundation. View source
4. Obstructive Sleep Apnea in Adults. American Academy of Sleep Medicine. View source