Sleep apnoea is one of the most common sleep disorders in the UK, yet more than 80% of people with the condition have never been diagnosed. The reason is straightforward: the most significant symptoms happen while you are asleep. You may be entirely unaware of them.
Obstructive sleep apnoea (OSA) occurs when the muscles at the back of the throat relax during sleep, causing the airway to narrow or close temporarily. Breathing stops for seconds at a time, sometimes dozens or hundreds of times per night. Each episode briefly rouses the brain to restart breathing, fragmenting sleep without the person realising.
The consequences extend well beyond feeling tired. Untreated OSA is associated with high blood pressure, cardiovascular disease, type 2 diabetes, depression, and significantly impaired daytime functioning. It also carries genuine road safety implications.
Here are ten signs that suggest your sleep may be more than just poor quality.
You snore loudly enough to disturb others
Snoring is the sound of a partially obstructed airway. Not everyone who snores has sleep apnoea, but loud snoring, particularly snoring audible through a closed door, is one of the most consistent early signs. If your partner has moved to another room, or if you have been told your snoring can be heard from outside the bedroom, it warrants investigation.
Someone has told you that you stop breathing during sleep
This is the single strongest clinical predictor of obstructive sleep apnoea. Witnessed apnoeas, where a bed partner or family member observes you stopping breathing, gasping, or snorting awake, are highly specific for the condition. If this has been reported to you, a sleep assessment is not optional. It is necessary.
You wake feeling unrefreshed, regardless of how many hours you sleep
This is frequently the complaint that brings people to their GP: "I sleep 7 or 8 hours but I still feel terrible in the morning." Fragmented sleep caused by repeated micro-arousals prevents progression into restorative deep and REM sleep stages. The duration of sleep is not the same as the quality of sleep.
You feel excessively sleepy during the day
Falling asleep in front of the television is one thing. Struggling to stay awake in meetings, in the car, or during tasks that require concentration is a different concern. Excessive daytime sleepiness, scored clinically with the Epworth Sleepiness Scale, is a core feature of moderate to severe sleep apnoea. Any tendency to fall asleep whilst driving must be taken seriously.
You wake with a headache most mornings
Morning headaches in people with sleep apnoea are caused by fluctuations in oxygen and carbon dioxide levels during repeated apnoea events overnight. They are typically dull, felt on both sides of the head, and resolve within an hour or two of waking. If this is a regular pattern alongside other symptoms on this list, sleep apnoea should be investigated.
You regularly wake with a dry mouth or sore throat
When the airway becomes obstructed, breathing often shifts from nasal to mouth breathing. Waking with a dry or sore mouth, particularly alongside snoring or restless sleep, is a useful indicator of nighttime airway obstruction.
You get up to use the toilet once or more most nights
Nocturia (getting up to urinate during the night) is commonly attributed to prostate issues or bladder problems, particularly in men over 50. However, obstructive sleep apnoea is a significant and often overlooked cause. Repeated apnoea events increase atrial natriuretic peptide, a hormone that promotes urine production. Treating the sleep apnoea often resolves the nocturia without any other intervention.
Your memory, concentration, or cognitive sharpness has declined
Patients often describe it as "brain fog": difficulty finding words, slower thinking, poorer short-term memory, reduced ability to multitask. These changes can be subtle enough to attribute to stress or ageing, but they are consistently documented in people with untreated sleep apnoea and typically improve significantly with treatment.
Your mood, patience, or mental wellbeing has changed
Disrupted sleep affects emotional regulation. Irritability, low mood, reduced motivation, and increased anxiety are all recognised features of chronic sleep disruption from apnoea. In some cases, people with undiagnosed sleep apnoea are treated for depression or anxiety for years before the underlying sleep disorder is identified.
You have high blood pressure, or it is difficult to control
OSA is a well-established secondary cause of hypertension. If you are taking antihypertensive medication and your blood pressure remains difficult to control, sleep apnoea is worth investigating. NICE guidance specifically recommends considering obstructive sleep apnoea in patients with resistant hypertension.
Home Sleep Testing
Think you might have sleep apnoea?
Our home sleep test delivers clinician-reviewed results from your own home, with no GP referral and no waiting list. Results within 2 working days of your test night.
Learn about home sleep testingWhen should you seek an assessment?
Any combination of two or more of these signs is a reasonable basis for investigating further. You do not need to wait for a GP referral or for symptoms to become severe before acting.
Certain symptoms warrant more prompt attention. If you have been told you stop breathing during sleep, or if you have experienced excessive sleepiness while driving or in safety-critical situations, seek assessment without delay. For professional drivers (HGV, bus, taxi, train), there are also legal obligations to the DVLA regarding fitness to drive with a sleep disorder.
Home sleep testing, using the same WatchPAT technology recommended by NICE, is now available privately across the UK. A qualified clinician reviews every result, and you will receive a plain-English explanation of your findings along with clear guidance on what to do next.
A note on this article
This article is a clinical guide to symptoms, not a diagnostic tool. A formal diagnosis of obstructive sleep apnoea requires an overnight sleep study interpreted by a qualified clinician. If you have significant symptoms, particularly observed apnoeas or severe daytime sleepiness, please speak to your GP or arrange a private assessment.