Wellness · Sleep & rest
Sleep apnoea — the pattern that should trigger a sleep study.
Loud snoring, morning headaches, daytime sleepiness — obstructive sleep apnoea is under-diagnosed and highly treatable. Here is the pattern to recognise.
Why trust this guide
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Clinically reviewed
Written by our editorial team and reviewed by a registered UK clinician before publication.
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Sourced from evidence
Every claim is checked against NICE, the British Thoracic Society or a peer-reviewed source you can see at the end.
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Practical, not preachy
A clear pattern to look for — and the specific next steps if it fits you.
Key facts
Sleep apnoea at a glance.
What OSA is, who is at risk, how it is diagnosed, and what treatment actually looks like.
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What it is
Obstructive sleep apnoea (OSA) — repeated collapse of the upper airway during sleep, causing pauses in breathing and drops in oxygen.
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Who is at risk
Adults over 40, higher BMI, larger neck circumference (over 17 in in men, 16 in in women), and men more than women — though women are under-diagnosed.
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The classic triad
Loud snoring, witnessed pauses in breathing, and excessive daytime sleepiness — together they raise the probability sharply.
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Screening tools
STOP-BANG (8 quick questions) and the Epworth Sleepiness Scale — both are free and used by NHS sleep clinics.
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The test
A home sleep study for most people; in-lab polysomnography where the picture is complex or central apnoea is suspected.
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Treatment
CPAP is transformative for moderate-to-severe OSA; mandibular advancement splints suit mild cases; weight loss reduces severity in almost everyone.
Why this guide matters
Under-diagnosed, highly treatable.
OSA is one of the most under-diagnosed conditions in adult medicine — and one of the most rewarding to treat. Three points shape the rest of this page.
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Trust the pattern
Snoring plus witnessed pauses plus daytime sleepiness is the combination that matters — not any one of them alone.
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Sleep studies settle it
The diagnosis needs objective data. A home sleep study is usually enough; sometimes an in-lab study is right.
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CPAP works when it fits
For moderate-to-severe OSA, CPAP is transformative — but tolerance depends heavily on getting the mask and pressure right.
The pathway
From first suspicion to settled treatment.
Seven steps — the signs to look for, the screening tools, and how a sleep study leads to treatment.
Phase 1 · Notice
Snoring, witnessed pauses, sleepiness
Phase 2 · Screen & test
STOP-BANG, Epworth, home sleep study
Phase 3 · Treat
CPAP or alternative, with follow-up
- 01
Notice
Note your snoring pattern
Loud, habitual snoring — worse on your back, worse after alcohol — is the most common opening clue.
- 02
Notice
Ask a bed partner about pauses
Witnessed apnoeas — silences ended by a gasp or snort — are one of the highest-value signs.
- 03
Notice
Log your daytime sleepiness
Take the Epworth Sleepiness Scale. A score above 10 is significant; above 15 is severe.
- 04
Screen & test
Run STOP-BANG
Snoring, Tiredness, Observed apnoeas, Pressure (blood), BMI, Age, Neck, Gender. A score of 3+ warrants a sleep study.
- 05
Screen & test
Book a home sleep study
A small device worn overnight measures airflow, oxygen and effort. Usually enough to make the diagnosis.
- 06
Treat
Interpret AHI with a specialist
The Apnoea-Hypopnoea Index grades severity: 5-14 mild, 15-29 moderate, 30+ severe. Context matters as much as the number.
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Treat
Trial CPAP or an alternative
Most people adapt to CPAP within a few weeks. If not tolerated, mandibular splints, positional therapy or weight loss are next.
Typical timeline: 4-8 weeks from first GP visit to a settled CPAP regime.
Signs it affects you
The pattern that should prompt a sleep study.
Any one of these can occur alone. It is the combination that raises the probability of OSA sharply.
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Loud snoring
Habitual, loud enough to disturb a partner or be heard through a wall.
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Witnessed apnoeas
A bed partner sees you stop breathing, then resume with a snort or gasp.
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Waking gasping
Suddenly waking short of breath, or with a choking sensation.
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Morning headaches
A dull headache on waking, easing over the first hour — a sign of nocturnal CO₂ retention.
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Daytime sleepiness
Falling asleep in meetings, on the sofa, or while reading — beyond ordinary tiredness.
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Low mood, poor concentration
Irritability, brain fog, memory slips — sleep-fragmentation effects often mistaken for depression.
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Resistant hypertension
Blood pressure that stays high despite 3+ medications — OSA is one of the leading treatable causes.
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Red flag: falling asleep driving
Do not drive. This is an urgent assessment — inform the DVLA once diagnosed.
Tests & treatment
The tests that diagnose OSA — and the treatments that work.
Diagnosis first, then treatment matched to severity, anatomy and lifestyle. Most people end up on CPAP or a mandibular splint.
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Home sleep study
A single-night home recording — airflow, oxygen saturation, chest effort. First-line for most adults.
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In-lab polysomnography
Full overnight study in a sleep unit — used where central apnoea, complex sleep or other disorders are suspected.
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CPAP therapy (gold standard)
Continuous Positive Airway Pressure holds the airway open. Transformative in moderate-to-severe OSA.
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Auto-titrating CPAP
Pressure adjusts through the night — often more comfortable, and used where fixed pressure is poorly tolerated.
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Mandibular advancement splint
A custom dental device that holds the jaw forward. Good for mild-to-moderate OSA or CPAP non-tolerance.
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Positional therapy
For supine-predominant OSA — devices or techniques that keep you off your back.
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Weight-loss programme
A 10% weight reduction typically cuts AHI by around 20-30%. Bariatric surgery is considered in selected cases.
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Surgical options (rarely)
ENT surgery, tonsillectomy or hypoglossal nerve stimulation in selected anatomy — not first-line for adults.
What this guide is based on
The sources behind every claim on this page.
UK national guidance and specialist society standards, current at the time of last review.
Key references
Guidelines and standards we relied on.
A quiet reminder
This guide is for information, not medical advice.
If you recognise this pattern in yourself, please see your GP and ask about a sleep-study referral — OSA is highly treatable once diagnosed.
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NICE NG202. Obstructive sleep apnoea/hypopnoea syndrome and obesity hypoventilation syndrome in over 16s.
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British Thoracic Society. Quality standards for adult sleep-disordered breathing.
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American Academy of Sleep Medicine. Clinical practice guidelines for the diagnosis and treatment of OSA.
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NHS. Obstructive sleep apnoea — overview.
Red flags
When it needs urgent assessment.
Any of these should shorten the timeline from suspicion to sleep study. Some are absolute driving-safety issues.
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Falling asleep while driving
A legal and safety emergency — stop driving; seek urgent assessment; inform the DVLA once diagnosed.
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Witnessed apnoeas
Silences in breathing ended by a gasp or snort — one of the highest-value signs of OSA.
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Waking gasping
Especially with morning headache or dry mouth — investigate promptly.
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Resistant hypertension
Blood pressure uncontrolled on 3+ medications — OSA is a leading treatable cause.
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Nocturnal arrhythmias
New atrial fibrillation, especially at night — OSA is a common contributor.
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Refractory heart failure
Difficult-to-control heart failure with sleep symptoms — screen for both obstructive and central apnoea.
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Post-stroke sleep symptoms
OSA is common after stroke and worsens recovery — worth a low threshold for testing.
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New OSA in pregnancy
Snoring or witnessed pauses in pregnancy — discuss urgently with your midwife or GP.
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Central apnoea features
Pauses without effort to breathe, Cheyne-Stokes pattern, or opioid use — a different diagnosis that needs an in-lab study.
Living with it
Diagnosis is the start, not the end.
Four principles that make the difference between a diagnosis on paper and treatment that actually changes your day.
A quiet reminder
Well-treated OSA looks like feeling normal again.
If sleepiness or morning headaches persist on treatment, that is a signal to review — not to accept.
- 01 Diagnosis
Trust the pattern, not one symptom
Snoring alone is common. It is the combination — snoring plus pauses plus sleepiness — that raises probability sharply.
- 02 Adherence
CPAP takes 2-4 weeks to settle
Mask fit and pressure are the two levers. Most tolerance issues are fixable with adjustments — go back to the sleep clinic.
- 03 Weight
Small losses matter
A 10% weight reduction typically cuts AHI meaningfully. It is worth pursuing alongside CPAP, not instead of it.
- 04 Escalation
If treatment is not working, escalate
Persistent sleepiness on CPAP is not normal. Ask for a review — pressures, comorbidities and adherence data can all be checked.
Frequently asked
Everything we get asked about sleep apnoea.
Quick answers on tests, CPAP, driving, and weight loss.
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How common is obstructive sleep apnoea?
Moderate-to-severe OSA affects around 1 in 20 UK adults, and mild OSA is more common still. It is significantly under-diagnosed — especially in women, where the presentation can differ.
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Do I need a sleep study, or can my GP diagnose it?
A GP can screen with STOP-BANG and Epworth and refer, but the diagnosis itself requires a sleep study — either at home or in a lab. It is not a clinical-only diagnosis.
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Is snoring on its own a sign of sleep apnoea?
Not necessarily — plenty of snorers do not have OSA. The concerning combination is snoring plus witnessed pauses plus daytime sleepiness. That pattern warrants a sleep study.
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What does CPAP actually feel like?
A mask over the nose (or nose and mouth) delivers gentle pressurised air, keeping the airway open. Most people adapt within 2-4 weeks. Mask fit is the single biggest tolerance factor.
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Can I drive if I have OSA?
If you have significant daytime sleepiness, you must not drive and you must inform the DVLA. Once treatment controls the sleepiness, driving is usually resumed under DVLA guidance.
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Will losing weight cure it?
It can reduce severity substantially — a 10% loss typically cuts AHI by 20-30%. In milder cases it may resolve the diagnosis; in moderate-to-severe cases, expect improvement alongside, not instead of, CPAP.
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