Sleep Apnoea Symptoms: Signs to Watch For

Obstructive sleep apnoea (OSA) is when the airway repeatedly narrows or closes during sleep, briefly interrupting your breathing. It is common and often missed: around 1.5 million adults in the UK are thought to have it, and most are undiagnosed. This guide explains the sleep apnoea symptoms to watch for, what severity grading actually means, and when snoring is worth a GP conversation.

What are the main symptoms of sleep apnoea?

Sleep apnoea symptoms fall into two groups: things that happen overnight (often spotted by a partner) and things you feel during the day. You rarely notice the night-time ones yourself, which is part of why the condition goes unrecognised for so long.

Here are the signs the NHS and sleep clinics look for:

Symptom	What it looks like
Loud snoring	Snoring most nights, often heavy enough to disturb a partner
Breathing pauses	Your breathing stops and starts, usually noticed by someone else
Gasping or choking	Sudden gasping, snorting or choking sounds during sleep
Unrefreshing sleep	Waking up tired even after a full night in bed
Daytime sleepiness	Nodding off at your desk, in front of the TV, or while driving
Morning headaches	A dull headache on waking, fading through the morning
Poor concentration	Trouble focusing, forgetfulness, foggy thinking
Mood changes	Irritability, low mood, or feeling flat

No single symptom confirms anything. It is the cluster that matters, especially loud snoring plus witnessed breathing pauses plus daytime tiredness. If two or three of these sound like you, that is a good reason to book an appointment, not a reason to panic.

Which symptoms matter most?

The strongest signals are the breathing pauses and the gasping or choking sounds. Snoring is the noise of air vibrating relaxed tissue in the throat, and on its own it is very common and usually nothing serious. What changes the picture is the airway actually closing, which causes those pauses and the abrupt gasp as breathing restarts.

Daytime tiredness is the symptom people most often dismiss. Feeling shattered after what should have been a decent night is easy to blame on stress or age, but persistent unrefreshing sleep is one of the clearest signals worth raising. If you find yourself fighting sleep at the wheel, treat that as urgent and speak to your GP promptly.

Worth knowing: symptoms do not always follow the textbook. Women more often report fatigue, insomnia, morning headaches and low mood rather than loud snoring and witnessed pauses, which is one reason OSA is under-recognised in women. Older adults can have frequent breathing events while feeling less obviously sleepy. So if the classic picture does not quite fit but something feels off about your sleep, it is still worth mentioning. If this sounds like you, snoring in women goes into more detail.

How is sleep apnoea severity graded?

This is the part to read carefully, because it is where a lot of confusion (and a lot of bad app marketing) creeps in.

Clinicians grade sleep apnoea using the apnoea-hypopnoea index, or AHI: the number of times your breathing pauses or drops per hour of sleep, measured during a proper sleep study. The NHS uses these bands:

• Mild: AHI 5 to 14 events per hour
• Moderate: AHI 15 to 30 events per hour
• Severe: AHI over 30 events per hour

Here is the crucial bit. AHI comes from a multi-channel sleep study, not from a phone, a smartwatch, or any consumer app. No app can produce your AHI, and no app can tell you which band you fall into. If a product implies it can, be sceptical. Severity grading is a doctor’s job, done with proper equipment.

Kip sits firmly on the wellness side of that line. It records and scores your snoring on your iPhone, tracking loudness, frequency and how those change over the weeks. It does not measure breathing pauses, it does not measure blood oxygen, and it does not assign an AHI or diagnose anything. What it gives you is a clear, honest record of your snoring to take into a GP appointment. If you want to understand the index itself, our explainer on what AHI means goes deeper.

Are STOP-BANG and Epworth the same as a diagnosis?

No, and this matters. STOP-BANG and the Epworth Sleepiness Scale are screening questionnaires. They help flag whether sleep apnoea is worth investigating. They do not, and cannot, diagnose it.

• STOP-BANG scores eight yes or no items (snoring, tiredness, observed apnoeas, blood pressure, BMI, age, neck size, and being male) from 0 to 8. A score of 3 or more is sensitive, meaning it rarely misses people who do have OSA, but it is not specific, meaning plenty of people who score high turn out not to have it. It points you toward a conversation, nothing more.
• The Epworth Sleepiness Scale scores how likely you are to doze off in eight everyday situations, from 0 to 24. A score above 10 suggests excessive daytime sleepiness. NICE specifically warns against using Epworth on its own to decide on referral.

Both are useful starting points to bring to your GP. Neither is a verdict. You can read more about each in our guides to the STOP-BANG questionnaire and the Epworth Sleepiness Scale.

When should I see a GP about these symptoms?

Book a GP appointment if your snoring is loud most nights and comes with any of the night-time or daytime signs above, particularly if a partner has seen you stop breathing, gasp or choke in your sleep. The NHS lists breathing that stops and starts, and gasping or snorting noises, as the patterns that may point to sleep apnoea, which can be serious if left untreated.

You do not need to wait until you are certain. The whole point of a GP visit is that they can decide whether to refer you to a sleep clinic for proper assessment. Untreated OSA is linked, at a population level, to raised blood pressure, heart problems, type 2 diabetes, low mood and a higher chance of accidents from tiredness. Those are associations across large groups of people, not a prediction about you, but they are exactly why it is worth getting checked rather than living with it for years.

To make the appointment more useful, walk in with something concrete. A week or two of tracked snoring data turns “my partner says I snore” into an actual record of how loud and how often. If you are unsure whether your snoring matters at all, is snoring bad for you is a good place to start. This guide is general information, not medical advice, so always follow current NHS guidance and your GP’s advice.

Sources

• NHS: Sleep apnoea
• NHS: Snoring
• NICE NG202: Obstructive sleep apnoea/hypopnoea syndrome
• Benjafield et al, Lancet Respiratory Medicine (global OSA prevalence)

FAQ

What are the early warning signs of sleep apnoea?

The earliest signs are usually loud, frequent snoring and waking up tired despite a full night’s sleep. A partner noticing breathing pauses, gasping or choking is a stronger signal. Morning headaches, daytime sleepiness and poor concentration often build up gradually, so they are easy to miss at first.

Can a phone app tell me if I have sleep apnoea?

No. No app can diagnose sleep apnoea, and none can measure your AHI or assign a severity grade. Only a clinical sleep study can do that. Apps like Kip are wellness tools that track snoring loudness and frequency over time, which can help you decide whether to talk to your GP and give you real data to bring along.

Is loud snoring always a sign of sleep apnoea?

No. Plenty of people snore loudly without having sleep apnoea, and snoring on its own is usually not serious. It is the combination of loud snoring with witnessed breathing pauses, gasping, and persistent daytime tiredness that suggests it is worth getting checked by a GP.