Sleep Apnoea UK: Causes, Symptoms & Treatments ( Guide)

What Is Sleep Apnoea?

Sleep apnoea — sometimes written "sleep apnea" in American English — is a condition in which your breathing repeatedly stops and starts during sleep. These pauses, called apnoeas, can last from a few seconds to over a minute and may occur dozens or even hundreds of times per night.

When your airway becomes blocked or your brain temporarily fails to signal the muscles that control breathing, oxygen levels in your blood drop. Your brain detects this and briefly wakes you — often so subtly that you don't remember it — to restore normal breathing. The result is severely fragmented sleep, even though you may spend seven or eight hours in bed.

In the UK, obstructive sleep apnoea (OSA) is by far the most common form, estimated to affect around 1.5 million adults, with the British Sleep Society suggesting that up to 85% of cases remain undiagnosed ^[1]. That means millions of people across the country are living with a condition that's treatable — and that carries serious long-term health consequences if left untreated.

The condition is not just about snoring or tiredness. Untreated sleep apnoea is linked to high blood pressure, atrial fibrillation, heart failure, stroke, type 2 diabetes, depression, and an increased risk of road traffic accidents. Getting a diagnosis and starting treatment can genuinely be life-changing — and in some cases, life-saving.

Types of Sleep Apnoea: Obstructive vs Central

Obstructive Sleep Apnoea (OSA)

OSA accounts for roughly 80–85% of all sleep apnoea cases. It occurs when the soft tissues at the back of your throat — the tongue, soft palate, and uvula — collapse inward and physically block your airway during sleep. This is the type most people think of when they hear "sleep apnoea." Risk factors include excess weight, large neck circumference, and certain anatomical features like a recessed jaw or enlarged tonsils.

During an OSA episode, your body continues to try to breathe, creating the characteristic snorting, gasping, or choking sounds that a bed partner may notice. Between episodes, breathing typically resumes with a loud snore.

Central Sleep Apnoea (CSA)

Central sleep apnoea is less common and works differently. Instead of a physical airway blockage, the problem lies in the brain's signalling. The brain temporarily fails to send the correct signals to the muscles that control breathing, so breathing simply stops — even though the airway is physically open.

CSA is more often associated with heart failure, stroke, high altitude, and the use of certain medications (particularly opioids). It's typically diagnosed through a specialist sleep study and managed differently from OSA — CPAP may still be used, but other treatments like adaptive servo-ventilation (ASV) or supplemental oxygen may be more appropriate.

Complex (mixed) sleep apnoea is a combination of both types and is sometimes identified when CPAP therapy alone isn't fully effective.

Common Symptoms of Sleep Apnoea

Sleep apnoea can be tricky to spot because its most dramatic symptoms happen while you're asleep. Many people assume they sleep fine — it's often a partner, family member, or even a colleague who first raises concerns. Here are the key signs to watch for:

During Sleep

• Loud, regular snoring — particularly snoring that's interrupted by pauses, gasps, or choking sounds
• Witnessed breathing pauses — a bed partner sees you stop breathing for seconds at a time
• Gasping or choking during sleep — often jolting you awake briefly (though you may not remember it)
• Restless sleep — frequent tossing, turning, or position changes
• Nocturnal urination — waking two or more times per night to use the toilet (nocturia)
• Morning headaches — typically a dull, diffuse headache that fades within an hour or two of waking
• Dry mouth or sore throat on waking

During the Day

• Excessive daytime sleepiness — falling asleep during meetings, while wa ... [OUTPUT TRUNCATED - 1951 chars omitted out of 51951 total] ... ick neck, a receding chin, or a deviated septum can all predispose you to airway collapse.
• Ethnicity: South Asian, African, and African-Caribbean populations have higher rates of OSA, partly related to craniofacial anatomy.

Modifiable Risk Factors

• Excess weight: The single biggest modifiable risk factor. Fat deposits around the neck and throat narrow the airway. Even a 10% reduction in body weight can reduce OSA severity by roughly 50% ^[2].
• Alcohol: Drinking alcohol — especially in the hours before bed — relaxes the throat muscles, making airway collapse more likely. Even moderate drinking can worsen existing OSA.
• Smoking: Smoking increases airway inflammation and fluid retention in the upper airway, worsening both snoring and OSA.
• Sedatives and sleeping tablets: Benzodiazepines and certain other medications suppress the respiratory drive and relax throat muscles.
• Sleeping on your back: Gravity pulls the tongue and soft palate backward in the supine position, increasing the risk of airway obstruction.

How Sleep Apnoea Is Diagnosed in the UK

Step 1: See Your GP

If you recognise the symptoms described above — or if your partner has raised concerns — book an appointment with your GP. They'll ask about your symptoms, medical history, and may use a screening tool like the Epworth Sleepiness Scale (ESS) or the STOP-BANG questionnaire to assess your risk.

Your GP may also check your BMI, neck circumference, and blood pressure, and look at the back of your throat for signs of tissue redundancy.

Step 2: Sleep Study (Polysomnography)

If your GP suspects sleep apnoea, they'll refer you to a local sleep clinic — either through your NHS Trust or a contracted community sleep service. The gold standard diagnostic test is an overnight polysomnography (PSG), which monitors:

• Airflow through the nose and mouth
• Breathing effort (chest and abdominal movement)
• Blood oxygen saturation (SpO2)
• Heart rate and rhythm
• Brain activity (EEG) to detect sleep stages and arousals
• Body position and limb movements

The study produces an Apnoea-Hypopnoea Index (AHI) — the number of breathing pauses per hour of sleep:

• Mild OSA: 5–14 events per hour
• Moderate OSA: 15–29 events per hour
• Severe OSA: 30+ events per hour

Home Sleep Testing

Many NHS sleep services now offer home sleep apnoea comparing (HSAT) as an alternative or first-line step. You're given a portable device to wear at home that monitors airflow, oxygen levels, and heart rate. This is more convenient and can shorten the pathway to diagnosis — though a full in-lab study may still be needed for complex cases or to assess other sleep disorders.

Waiting times vary significantly by region. In some areas, the wait from GP referral to sleep study can be several weeks to a few months. If waiting times are a concern, private sleep clinics (typically £150–£300 for an initial consultation) can offer faster access, though tHe compares themselves and any subsequent treatment may carry additional costs.

The British Sleep Society publishes guidelines on best practice for sleep services and recommends that any adult with suspected OSA should be referred to a specialist sleep service for objective assessment ^[3].

Treatment Options for Sleep Apnoea

The good news: sleep apnoea is highly treatable. Treatment depends on the severity of your condition, the underlying cause, and your personal preferences. Here are the main options:

CPAP (Continuous Positive Airway Pressure)

CPAP remains the gold-standard treatment for moderate to severe obstructive sleep apnoea. A CPAP machine delivers a steady stream of pressurised air through a mask worn over the nose (or nose and mouth), acting as a pneumatic splint that keeps the airway open throughout the night.

• Effectiveness: When used consistently, CPAP eliminates apnoea events in over 95% of patients. It's one of the most effective treatments in all of sleep medicine.
• NHS provision: If OSA is confirmed via NHS referral, a CPAP machine is typically provided free of charge through your local Trust or contracted provider.
• Compliance challenge: The main drawback is adherence. Studies show that roughly 30–50% of patients struggle with CPAP in the first few months. Common issues include mask discomfort, nasal congestion, skin irritation, and feeling claustrophobic. Modern machines are much quieter and more comfortable than older models — heated humidification, auto-adjusting pressure, and a range of mask styles (nasal pillows, nasal masks, full-face masks) help.
• Titration: Most patients undergo a "mask fitting" and pressure titration session, either in-lab or via an auto-CPAP device that adjusts pressure throughout the night.

Mandibular Advancement Devices (MADs)

A mandibular advancement device is a custom-fitted dental appliance — similar in concept to a sports mouthguard — that holds the lower jaw (mandible) slightly forward during sleep. This repositions the tongue and soft palate, widening the airway and reducing the likelihood of collapse.

• Best for: Mild to moderate OSA, or patients who can't tolerate CPAP. The British Sleep Society and the American Academy of Sleep Medicine both endorse MADs as a first-line treatment for mild-to-moderate OSA ^[4].
• Effectiveness: MADs can reduce the AHI by 50% or more in appropriate patients, though they're generally less effective than CPAP for severe OSA.
• Fitting: In the UK, MADs are typically fitted by a dentist with specific training in dental sleep medicine. Cost ranges from roughly £200–£1,000 depending on the type and provider. Some NHS services provide them; private dental clinics are the more common route.
• Side effects: Common but usually manageable — jaw discomfort, excessive salivation, dry mouth, and minor tooth movement. These tend to settle within a few weeks.

Other Medical Treatments

• BiPAP (Bilevel Positive Airway Pressure): Similar to CPAP but delivers different pressures for inhalation and exhalation. Used when CPAP isn't tolerated or for central sleep apnoea.
• Adaptive Servo-Ventilation (ASV): A more sophisticated device that adapts to your breathing pattern in real time. Primarily used for central or complex sleep apnoea.
• Hypoglossal nerve stimulation: An implantable device (like the Inspire system) that stimulates the nerve controlling tongue movement, preventing airway collapse. Available privately in the UK for patients who can't tolerate CPAP or MADs.
• Surgical options: In selected cases, surgery may be appropriate — uvulopalatopharyngoplasty (UPPP), maxillomandibular advancement, or tonsillectomy (particularly in children with OSA). Surgery is generally considered when anatomical issues are the primary cause and other treatments have failed.
• Positional therapy: For patients whose OSA occurs primarily when sleeping on their back, wearable devices that encourage side-sleeping can be effective.

Lifestyle Changes That Can Help

While lifestyle modifications alone rarely cure moderate-to-severe sleep apnoea, they can meaningfully reduce severity and improve treatment outcomes:

Weight Management

This is the most impactful change for overweight individuals. Even modest weight loss — 10–15% of body weight — can dramatically reduce the AHI. For some people, it eliminates the need for CPAP entirely. The NHS offers weight management services, and your GP can refer you to a dietitian if needed.

Reduce Alcohol Consumption

Alcohol relaxes the throat muscles and worsens airway collapse. If you drink, avoid alcohol within three to four hours of bedtime. Cutting back overall can reduce snoring frequency and OSA severity.

Sleep Position

Back-sleeping (supine position) worsens OSA in many people due to gravity pulling the tongue backward. Simple strategies like sleeping on your side — using a body pillow, tennis ball technique, or a positional therapy device — can help.

Quit Smoking

Smoking causes inflammation and fluid retention in the upper airway. Quitting reduces these effects and improves both sleep quality and overall health. NHS Stop Smoking services are available free of charge.

Review Medications

Some medications — particularly sedatives, benzodiazepines, and certain opioids — worsen sleep apnoea. If you're on any of these, speak to your GP or specialist about alternatives.

When to See Your GP

Don't wait for symptoms to become severe. You should see your GP if:

• Your partner has noticed you snore loudly with regular pauses or gasping sounds
• You feel excessively tired during the day, even after what seems like enough sleep
• You've been told you stop breathing in your sleep
• You regularly wake with headaches, a dry mouth, or a sore throat
• You've had a road traffic accident or near-miss due to drowsiness
• You have high blood pressure that's difficult to control, especially if you're under 50
• You've been diagnosed with atrial fibrillation, heart failure, or type 2 diabetes and have risk factors for OSA

Sleep apnoea is a medical condition, not a lifestyle quirk. There's no need to feel embarrassed about discussing snoring or daytime sleepiness with your doctor — GPs see this regularly, and early diagnosis leads to better outcomes.

The NHS 111 service can also provide guidance if you're unsure whether you need to see a GP, and the British Lung Foundation offers a sleep apnoea helpline and information resources.

Frequently Asked Questions