What Is Sleep Apnoea? Causes, Symptoms and Treatment
Sleep apnoea is a condition where your breathing repeatedly stops and starts while you sleep. It is surprisingly common, frequently goes undiagnosed for years, and — importantly — it is very treatable once identified. Because it happens while you are asleep, many people have no idea it is occurring; often it is a partner who first notices the loud snoring and the alarming pauses in breathing.
Left untreated, sleep apnoea does more than make you tired. The repeated drops in oxygen and the constant interruptions to deep sleep place a strain on the heart and the rest of the body over time. The good news is that effective therapy can transform how you feel, often within weeks.
The main types of sleep apnoea
There are three broad types, and they have different underlying causes:
- Obstructive sleep apnoea (OSA) — by far the most common. The muscles at the back of the throat relax during sleep and the airway narrows or collapses, briefly blocking airflow despite the effort to breathe.
- Central sleep apnoea — less common. The brain temporarily fails to send the right signals to the muscles that control breathing, so effort itself pauses.
- Mixed or complex sleep apnoea — a combination of the two, where features of both are present.
Most people who are diagnosed have obstructive sleep apnoea, where the problem is a mechanical one in the airway rather than a signalling one in the brain.
What happens to your body during an apnoea
During an obstructive event, the airway closes and airflow stops for a few seconds or longer. The level of oxygen in the blood dips, and the brain — sensing the problem — briefly rouses you just enough to tighten the airway muscles and take a breath, often with a gasp or snort. You usually do not wake fully or remember it, but this cycle can repeat dozens or even hundreds of times a night.
The result is twofold: your sleep is fragmented so you never get enough restorative deep sleep, and your body is repeatedly stressed by falling oxygen levels. That combination explains why untreated sleep apnoea leaves people exhausted and, over time, can affect blood pressure and heart health.
Common signs and symptoms
- Loud, habitual snoring, often with witnessed pauses, gasping or choking.
- Waking unrefreshed despite a full night in bed.
- Excessive daytime sleepiness, dozing off easily, and difficulty concentrating.
- Morning headaches and a dry mouth or sore throat on waking.
- Irritability, low mood, and waking frequently to pass urine.
Not everyone with sleep apnoea snores, and not everyone who snores has sleep apnoea — which is exactly why proper testing matters rather than guesswork.
Who is more at risk
Several factors raise the likelihood of obstructive sleep apnoea, including excess weight, a larger neck circumference, being male, increasing age, smoking, alcohol before bed, nasal congestion and certain features of the jaw or airway. Having one or more risk factors does not mean you have sleep apnoea — but combined with symptoms, it is a good reason to get assessed.
How sleep apnoea is diagnosed
The condition is diagnosed with a sleep study, which records your breathing, oxygen levels, heart rate and other signals overnight. Reassuringly, many studies can now be done at home, in your own bed, which is more convenient and often more representative of a normal night than sleeping in a clinic. The study produces a measure called the AHI — the average number of breathing pauses per hour — which your doctor uses, alongside your symptoms, to gauge severity.
How sleep apnoea is treated
Treatment depends on the type and severity. For many people with obstructive sleep apnoea, the most effective therapy is CPAP — a small machine that delivers a gentle, continuous stream of air through a mask to keep the airway open. Where higher pressures or more support are needed, a BiPAP machine, which eases exhalation, may be used instead. Lifestyle changes such as weight loss, reducing alcohol, stopping smoking and adjusting sleep position can also help, sometimes alongside therapy.
The encouraging message is that sleep apnoea responds well to treatment. People who start effective therapy often describe feeling like themselves again — more energy, clearer thinking, and better mood — once their sleep is no longer broken night after night.
Why untreated sleep apnoea matters
It is tempting to dismiss sleep apnoea as “just snoring” or ordinary tiredness, but the consequences of leaving it untreated reach well beyond a poor night’s sleep. Each apnoea briefly stresses the body, and over months and years that repeated strain — combined with chronically fragmented sleep — can take a toll on overall health.
- Daytime sleepiness raises the risk of accidents, including at the wheel and at work.
- Repeated dips in oxygen and disturbed sleep place ongoing strain on the heart and blood pressure.
- Concentration, memory and mood often suffer, affecting work and relationships.
- Partners’ sleep is disrupted too, which is why so many people are first prompted to seek help by a family member.
The reassuring flip side is that effective treatment reverses much of this. When breathing stays steady through the night, deep sleep returns, energy and concentration improve, and the nightly strain on the body eases. For many people, treating sleep apnoea is one of the most noticeable improvements they make to their health.
What starting treatment is really like
People often imagine that treating sleep apnoea means a lifetime tethered to an uncomfortable machine. In practice, most find the reality far gentler than they feared. Modern CPAP and BiPAP machines are quiet, the masks come in several styles to suit different faces and breathing habits, and a heated humidifier keeps the air comfortable. The first few nights take some adjustment — that is completely normal — but most people settle in within a week or two with the right mask fit and a little support.
What tends to surprise people most is how quickly they feel the benefit. When breathing stays steady through the night, the deep, restorative stages of sleep return, and the relentless daytime tiredness begins to lift. Many describe waking genuinely refreshed for the first time in years, with clearer thinking and steadier mood. That early reward is often what turns therapy from a chore into something people are glad to continue.
It also helps to know that you are not on your own with it. A good provider fits your mask in person, shows you how to use and clean the equipment, and stays reachable through those first weeks while you find your feet. Small adjustments — a different mask cushion, a tweak to the straps, using the ramp feature — resolve most early niggles. The key message is simple: if therapy feels difficult at first, that is usually a fixable comfort issue, not a reason to give up on a treatment that works.
Can sleep apnoea be reduced?
Alongside medical treatment, several everyday measures can help reduce the severity of obstructive sleep apnoea — and for milder cases, sometimes make a meaningful difference on their own. Your doctor will advise what is appropriate for you, but common steps include:
- Reaching and maintaining a healthy weight, which can ease pressure on the airway.
- Avoiding alcohol and sedatives in the evening, as they relax the airway muscles.
- Stopping smoking, which reduces airway inflammation over time.
- Sleeping on your side rather than your back, if your breathing is worse lying flat.
- Treating nasal congestion so you breathe more easily through the night.
These measures complement, rather than replace, the therapy your doctor recommends. For moderate to severe sleep apnoea, devices such as CPAP or BiPAP remain the mainstay of effective treatment, often with lifestyle changes alongside.
This article is general information, not medical advice. If you have symptoms of sleep apnoea, please speak to a doctor about a proper assessment and a sleep study.
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