Substantially underdiagnosed, and treating it changes how people feel more than almost anything else.
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Obstructive sleep apnoea is repeated collapse of the airway during sleep. Breathing stops for seconds at a time, oxygen falls, and the brain briefly rouses to restart it — sometimes hundreds of times a night. You do not remember any of it. You simply wake unrefreshed.
It is common, it is substantially under-diagnosed, and it matters well beyond tiredness — untreated it raises the risk of high blood pressure, atrial fibrillation, stroke, type 2 diabetes and road traffic accidents.
Three things worth knowing:
1. It is badly under-diagnosed in women, because the textbook picture is a large snoring man. Women more often present with insomnia, fatigue, morning headache, low mood and "brain fog" — and get treated for depression, anaemia or the menopause instead. Risk rises sharply after the menopause. See our article on sleep apnoea in women.
2. There is a legal duty around driving. If you have sleep apnoea causing excessive daytime sleepiness you must not drive, and must notify the DVLA. Treated effectively, most people drive normally again — but the obligation is real, and this is not something to discover later.
3. If your blood pressure needs three or more tablets and still is not controlled, get screened for this. Sleep apnoea is a leading cause of resistant hypertension and is routinely not looked for.
The reason so many are missed:
Snoring, pauses, mouth breathing, restless sleep — and then hyperactivity, irritability and poor concentration rather than sleepiness. Frequently mistaken for behavioural difficulty or ADHD. Usually caused by large tonsils and adenoids, and often curable by removing them.
During sleep the throat muscles relax. Where the airway is already narrow, it collapses — breathing stops until the brain rouses enough to reopen it. Each rousing fragments sleep without waking you properly, which is why the tiredness is profound and the cause invisible.
Repeated oxygen dips and surges of adrenaline overnight have consequences:
Not simply snoring. Plenty of people snore without sleep apnoea. What distinguishes it is the pauses, the gasping, and the daytime consequences — and not simply a matter of being overweight, since airway shape matters as much as size.
Sleep apnoea is suspected from the history and confirmed by a sleep study. The history part suits a video consultation well, and this is one area where a private route can save a long wait.
Diagnosis requires one — usually a home study, wearing a small device overnight in your own bed. It measures breathing, oxygen and heart rate, and produces an index of how many events per hour. Straightforward, done at home, and we can arrange it.
A smartwatch or phone app is not a diagnosis — though if yours is flagging low overnight oxygen or breathing disturbance, that is a perfectly good reason to get properly assessed.
Thyroid function, HbA1c, cholesterol and full blood count — partly to look for contributors, partly because the cardiovascular and metabolic risks travel together.
Anyone with blood pressure needing three or more medications and still not controlled should be screened for sleep apnoea. It is a leading cause of resistant hypertension, and treating it can transform blood pressure control.
A machine delivering gently pressurised air through a mask, holding the airway open. For moderate to severe sleep apnoea it is highly effective, and many people describe the first properly slept night as transformative.
The honest part: the first few weeks are the hard bit, and most people who abandon CPAP do so early. What determines success:
A custom-made dental appliance holding the lower jaw forward. Effective for mild to moderate disease, and for people who cannot tolerate CPAP. It must be properly fitted by a dentist experienced in these — shop-bought "anti-snoring" gum shields are not the same thing.
A 10% weight reduction can substantially reduce the severity, and in mild cases can resolve it. This is one of the situations where the newer weight loss medications are genuinely relevant, and we can discuss whether you would qualify — see weight management.
Sleep clinics for CPAP provision, ENT for nasal or tonsil surgery, and paediatric ENT for children, where adenotonsillectomy is frequently curative.
If you have excessive sleepiness, you must not drive, and you must inform the DVLA if diagnosed with sleep apnoea causing it. Failing to do so has legal and insurance consequences. Most people resume driving once treatment is effective, and we will tell you where you stand rather than leaving you to work it out.
Stop driving immediately and seek urgent advice if:
Seek prompt medical attention for:
Book an appointment for:
The most useful piece of information here comes from a partner: do you stop breathing, and do you gasp or choke? If you sleep alone, a phone recording overnight is genuinely informative — and often the thing that finally prompts someone to get assessed.
Rate how likely you are to doze in eight everyday situations. It converts "I'm just tired" into a number, it is what sleep services use, and bringing a completed score to an appointment moves things along considerably.
Most people who stop do so in the first few weeks. If it is not working for you, the answer is almost always the mask rather than the machine:
Do not drive if you are excessively sleepy. If you are diagnosed with sleep apnoea causing sleepiness, you must tell the DVLA. Most people return to normal driving once treated — but the duty is legal, and insurance may not cover an accident where it was not declared.
Worth reading twice. Sleep apnoea in women frequently presents as insomnia, exhaustion, morning headache, low mood and brain fog rather than snoring and daytime dozing — and risk rises considerably after the menopause. It is regularly treated as depression, anaemia or the menopause for years. If you wake unrefreshed most mornings, it is worth asking the question.
Sleep apnoea is one of the most under-diagnosed conditions in general practice, and it is entirely treatable — which makes recognising it far more valuable than most things on this site.
NHS sleep services are free, provide home sleep studies, and supply CPAP machines free of charge. That is the right route, and NHS CPAP provision includes the masks, the servicing and the follow-up, which privately purchased machines do not.
The thing most worth knowing is who gets missed. Sleep apnoea is under-recognised in women, in people who are not overweight, and in anyone whose main complaint is fatigue rather than snoring — and it is regularly treated as depression, insomnia or an underactive thyroid for years.
The other consequence people are not told about is driving. Excessive sleepiness affecting driving must be reported to the DVLA, and driving while excessively sleepy is a legal as well as a safety issue. Treated sleep apnoea generally allows driving to continue, which is why diagnosis helps rather than harms.
Where a private consultation adds value is a prompt assessment using the Epworth and STOP-BANG scores and a referral, since NHS sleep clinic waits can be long.
Untreated sleep apnoea raises blood pressure and cardiovascular risk, so this is not simply about feeling tired.
Where money is wasted: anti-snoring devices bought before any diagnosis, and consumer wearables marketed as detecting apnoea.
NICE NG202, Obstructive sleep apnoea/hypopnoea syndrome and obesity hypoventilation syndrome in over 16s, is the governing guideline. It recommends using the Epworth Sleepiness Scale alongside clinical assessment, and referral to a sleep service for diagnostic testing.
NG202 recommends CPAP as first-line treatment for moderate to severe OSAHS, and for mild disease where symptoms affect quality of life.
NG202 recommends mandibular advancement splints as an option for mild OSAHS or where CPAP is not tolerated.
NG202 addresses driving, requiring clinicians to advise patients of their legal obligation to inform the DVLA where excessive sleepiness affects driving — the basis for the point above.
DVLA guidance sets out that driving must cease until symptoms are controlled, after which licensing is usually restored.
NG202 also covers weight management, which improves severity but does not replace CPAP in established disease.
No. Plenty of people snore harmlessly. What distinguishes sleep apnoea is the pauses in breathing, the gasping or choking, and the daytime consequences — waking unrefreshed, dozing off, morning headaches. Snoring alone is a nuisance; sleep apnoea raises blood pressure, stroke and accident risk.
Yes. Airway shape matters as much as size — a small or set-back jaw, a crowded throat, large tonsils or a blocked nose all narrow the airway in people of entirely normal weight. Weight is the strongest single risk factor, not a requirement.
That is exactly why women are under-diagnosed. In women it more often looks like insomnia, exhaustion, morning headache, low mood and brain fog than loud snoring and daytime dozing — and it is regularly treated as depression or the menopause for years. Risk rises sharply after the menopause. If you wake unrefreshed most days, ask the question.
Not if you are excessively sleepy — and if you are diagnosed with sleep apnoea causing sleepiness, you must notify the DVLA. That is a legal duty, and insurance may not cover an accident where it was not declared. The good news: most people drive normally again once treatment is working, so this is a temporary interruption rather than a permanent loss.
Worth revisiting — the problem is almost always the mask rather than the machine, and there are many types. Ask to try a different one, add humidification for dryness, use the ramp setting, and treat any nasal blockage first. Most people who abandon CPAP do so in the first few weeks, before it has had a chance to work. A mandibular advancement device is also a genuine alternative.
It can, particularly in milder cases — a 10% reduction substantially lowers severity. It is one of the situations where the newer weight loss medications are clinically relevant rather than cosmetic, and worth discussing. But do not delay treatment while working on weight; use both.
No — consumer devices cannot diagnose sleep apnoea, and they produce plenty of false alarms. But if yours is consistently flagging disturbed breathing or low overnight oxygen, that is a perfectly reasonable prompt to arrange a proper home sleep study.
Worth investigating together rather than separately. Children with sleep apnoea often present with hyperactivity, irritability and poor concentration rather than sleepiness, and it is regularly mistaken for behavioural difficulty or ADHD. It is usually caused by large tonsils and adenoids, and removing them is frequently curative.
August 23, 2026
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