Can you have sleep apnea if you don't snore?

Yes. While snoring is the most common symptom of obstructive sleep apnea, not everyone with sleep apnea snores loudly, and some people with significant apnea are relatively quiet sleepers. Central sleep apnea in particular often occurs without prominent snoring. Other symptoms like excessive daytime sleepiness, morning headaches, and observed apnea episodes should prompt evaluation regardless of snoring.

Is sleep apnea dangerous if left untreated?

Yes. Untreated sleep apnea significantly increases the risk of high blood pressure, heart disease, stroke, type 2 diabetes, and motor vehicle accidents. It also markedly impairs quality of life and cognitive function. Treatment, particularly CPAP, dramatically reduces these risks.

Do I have to use CPAP forever?

CPAP controls sleep apnea but does not cure it — stopping use typically causes symptoms to return immediately. However, if the underlying cause is addressed (such as significant weight loss or anatomical correction with surgery), sleep apnea may improve enough that CPAP is no longer needed. This should always be assessed with a repeat sleep study.

Can children have sleep apnea?

Yes. Paediatric sleep apnea is more common than many parents realise, with enlarged tonsils and adenoids being the most frequent cause in children. Symptoms in children can differ from adults and may include mouth breathing, bed-wetting, hyperactivity, and poor school performance. The most common treatment in children is surgical removal of the tonsils and adenoids.

How effective is CPAP therapy?

When used consistently (most nights, for most of the night), CPAP is extremely effective — typically eliminating apnea events almost entirely. The challenge is adherence: many people find the mask uncomfortable initially, and it can take 2–4 weeks of adjustment to become comfortable. Working with your sleep clinic to optimise mask fit and pressure settings is essential.

Sleep Apnea: Causes, Symptoms, and Treatment

Sleep apnea is a serious sleep disorder in which breathing repeatedly stops and restarts during sleep. These pauses — called apneas — can last from a few seconds to over a minute, occur hundreds of times per night, and prevent sufferers from reaching the deep, restorative stages of sleep. It is estimated to affect over 936 million adults worldwide, yet the majority remain undiagnosed.

What Is Sleep Apnea?

The word "apnea" comes from the Greek for "without breath." During a sleep apnea event, airflow to the lungs is partially or completely obstructed, causing oxygen levels in the blood to drop. The brain then triggers a brief arousal — often too brief to be remembered — to restart breathing. This cycle can repeat dozens or hundreds of times per night, severely fragmenting sleep without the person being fully aware of it.

There are three primary types of sleep apnea:

Obstructive Sleep Apnea (OSA): By far the most common type, accounting for approximately 84% of cases. The throat muscles relax during sleep, causing the soft tissues at the back of the throat to collapse and partially or completely block the airway.
Central Sleep Apnea (CSA): A less common form in which the brain fails to send the correct signals to the muscles that control breathing. Unlike OSA, the airway is not physically blocked. CSA is often associated with heart failure, opioid use, or neurological conditions.
Complex Sleep Apnea Syndrome: A combination of both OSA and CSA, sometimes called treatment-emergent central sleep apnea, as it can develop after starting CPAP therapy for OSA.

Symptoms of Sleep Apnea

The challenge with sleep apnea is that the most dramatic symptoms occur during sleep, when the sufferer is unaware. Partners and household members are often the first to notice the signs. Classic symptoms include:

Loud, chronic snoring: Often the most obvious sign. Not everyone who snores has sleep apnea, but most people with sleep apnea snore significantly.
Observed apnea episodes: A bed partner noticing that breathing stops, sometimes followed by a gasp, snort, or choking sound as breathing resumes.
Waking with a dry or sore mouth: Caused by breathing through the mouth during sleep.
Morning headaches: A result of reduced oxygen and elevated carbon dioxide levels during the night.
Excessive daytime sleepiness (EDS): Profound fatigue and sleepiness during the day despite spending enough time in bed, sometimes severe enough to cause falling asleep at inappropriate times.
Cognitive impairment: Difficulty concentrating, poor memory, and mental fog — often mistaken for stress or ageing.
Mood changes: Irritability, depression, and anxiety are significantly more prevalent in people with untreated sleep apnea.
Nocturia: Frequently waking to urinate at night. This is more common in sleep apnea patients than the general population.

It is important to note that not everyone with sleep apnea snores loudly, and some people with severe sleep apnea report no symptoms beyond tiredness. This is why so many cases go undetected.

Who Is at Risk?

Obstructive sleep apnea can affect anyone — including children — but certain factors significantly increase the risk:

Excess weight: Obesity is the single biggest modifiable risk factor. Fat deposits around the upper airway narrow and obstruct the airway during sleep.
Neck circumference: A neck circumference greater than 17 inches (43cm) in men or 15 inches (38cm) in women is associated with higher risk.
Age: The prevalence of sleep apnea increases with age, particularly after 40.
Sex: Men are two to three times more likely to have sleep apnea than premenopausal women. After menopause, the risk in women increases substantially.
Anatomy: A naturally narrow airway, large tonsils or adenoids, a large tongue, or a small or receding jaw can predispose to OSA.
Family history: There is a genetic component to sleep apnea risk.
Nasal congestion: Chronic nasal obstruction, from allergies or structural issues, doubles the risk of OSA.
Smoking and alcohol: Smoking inflames the upper airway; alcohol relaxes throat muscles, both worsening apnea.
Medical conditions: Hypothyroidism, type 2 diabetes, PCOS, and hypertension are all associated with elevated sleep apnea risk.

Health Consequences of Untreated Sleep Apnea

Sleep apnea is not simply a nuisance — it is a medically significant condition with serious long-term health implications if left untreated. Each apnea event causes a surge in blood pressure and stress hormones, puts strain on the heart, and triggers low-grade inflammation. Over years, this takes a significant cumulative toll:

Cardiovascular disease: Untreated OSA is an independent risk factor for hypertension, heart attack, stroke, atrial fibrillation, and heart failure.
Type 2 diabetes: Sleep apnea impairs insulin sensitivity and glucose metabolism, contributing to the development and worsening of type 2 diabetes.
Cognitive decline: There is growing evidence linking untreated sleep apnea to increased dementia risk, with some studies showing faster cognitive decline in older adults with OSA.
Depression and anxiety: These are both cause and consequence of sleep apnea, in a self-reinforcing cycle.
Road accidents: People with untreated sleep apnea have a significantly elevated risk of motor vehicle accidents due to impaired vigilance and reaction time.

How Is Sleep Apnea Diagnosed?

If sleep apnea is suspected, a doctor will typically refer you for a sleep study. There are two main options:

Polysomnography (in-lab sleep study): The gold standard diagnostic tool. You spend a night in a sleep laboratory while sensors monitor your brain waves, eye movements, muscle activity, oxygen levels, airflow, and heart rate. This test can diagnose OSA, CSA, and other sleep disorders simultaneously.

Home Sleep Apnea Test (HSAT): For straightforward cases of suspected moderate-to-severe OSA in otherwise healthy adults, a simplified home monitoring device can be used. It measures airflow, breathing effort, and oxygen levels but does not include the full range of measures captured in a lab study. A negative home test does not rule out sleep apnea.

Sleep apnea severity is measured by the Apnea-Hypopnea Index (AHI): the average number of apneas and hypopneas (partial breathing reductions) per hour of sleep. Mild sleep apnea is an AHI of 5–14, moderate is 15–29, and severe is 30 or more.

When to Speak With a Doctor

See a doctor promptly if you or your bed partner have noticed you stop breathing during sleep, if you experience excessive daytime sleepiness that affects your ability to drive safely or function at work, or if you have any of the major risk factors for sleep apnea alongside persistent fatigue and morning headaches. Untreated sleep apnea carries serious cardiovascular risk.

Treatment Options

Treatment depends on the type and severity of sleep apnea, along with individual health factors and preferences. Options include:

CPAP therapy: Continuous Positive Airway Pressure is the most effective and widely used treatment for moderate-to-severe OSA. A CPAP machine delivers a steady stream of pressurised air via a mask worn during sleep, keeping the airway open throughout the night. When used consistently, CPAP is highly effective and the cardiovascular benefits are substantial.
Mandibular advancement devices (MADs): Custom-fitted oral appliances that hold the jaw forward during sleep, enlarging the airway. They are generally less effective than CPAP but significantly better tolerated, making them a good option for mild-to-moderate OSA or those who cannot use CPAP.
Positional therapy: For people whose sleep apnea occurs primarily in the supine (back-sleeping) position, learning to sleep on their side can dramatically reduce apnea episodes.
Weight loss: In people with obesity-related OSA, significant weight loss can reduce AHI substantially and sometimes resolve sleep apnea completely.
Upper airway surgery: Various surgical procedures — including uvulopalatopharyngoplasty (UPPP), tonsillectomy, and maxillomandibular advancement — can widen the airway. They are generally considered after other treatments have failed.
Hypoglossal nerve stimulation: An implanted device (such as Inspire) that delivers gentle stimulation to the nerve controlling the tongue during sleep, preventing collapse. Suitable for specific patients with moderate-to-severe OSA who cannot tolerate CPAP.

References

Benjafield AV, et al. Estimation of the global prevalence and burden of obstructive sleep apnea. The Lancet Respiratory Medicine. 2019;7(8):687–698.
Patil SP, et al. Adult obstructive sleep apnea: pathophysiology and diagnosis. Chest. 2007;132(1):325–337.
American Academy of Sleep Medicine. Clinical practice guideline for the treatment of obstructive sleep apnea in adults. 2019.
Young T, et al. The occurrence of sleep-disordered breathing among middle-aged adults. New England Journal of Medicine. 1993;328(17):1230–1235.
Peppard PE, et al. Increased prevalence of sleep-disordered breathing in adults. American Journal of Epidemiology. 2013;177(9):1006–1014.