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7 Signs You Might Have Sleep Apnoea (And Why Most People Go Undiagnosed)

Obstructive sleep apnoea (OSA) affects an estimated 936 million adults worldwide, making it one of the most prevalent sleep disorders. Yet studies suggest that up to 80–90% of cases remain undiagnosed. Many people have been told they "just snore" for years without recognising the signs of a medically serious condition.

Sign 1: Loud, Irregular Snoring with Pauses

Benign snoring is generally consistent and rhythmic. OSA-related snoring is characterised by loud snoring punctuated by silences (the apnoea — a cessation of breathing), often ending with a choking, gasping, or snorting sound as breathing resumes. If your partner has ever reported that you "stopped breathing" during the night, this should be taken seriously. This is distinct from common soft palate snoring which does not involve breathing pauses.

Sign 2: Waking Unrefreshed Despite Adequate Sleep Hours

People with untreated OSA typically experience dozens to hundreds of micro-arousals per night as the brain activates to restore breathing. These arousals are too brief to be consciously remembered but profoundly fragment sleep architecture. The result: you slept 7–8 hours but feel as though you barely rested.

Sign 3: Excessive Daytime Sleepiness

Clinically significant daytime sleepiness — falling asleep in meetings, while watching TV, or at the wheel — is one of the cardinal symptoms of OSA. The Epworth Sleepiness Scale (ESS) is a validated screening tool; a score above 10 suggests significant daytime somnolence warranting investigation. Falling asleep while driving is a medical emergency — do not ignore this symptom.

Sign 4: Morning Headaches

Repeated nocturnal hypoxia (low blood oxygen during apnoeas) causes cerebral vasodilation. Many OSA sufferers wake with dull, diffuse headaches that resolve within an hour of waking. This pattern is distinct from tension or migraine headaches, which typically have different onset and character.

Sign 5: Waking with a Dry Mouth or Sore Throat

OSA almost always involves mouth breathing during obstructed periods. Consistent mouth breathing dries the oropharyngeal mucosa, resulting in a dry mouth and often a sore throat on waking. This symptom alone is not diagnostic, but in combination with others it is a useful signal.

Sign 6: Nocturia (Waking Repeatedly to Urinate)

A less well-known but important OSA symptom. The negative intrathoracic pressure generated during obstructed breathing triggers the release of atrial natriuretic peptide (ANP), a hormone that increases urine production. Many OSA patients wake 2–4 times per night to urinate and are incorrectly treated for bladder or prostate problems for years.

Sign 7: Cognitive Impairment and Mood Changes

Chronic intermittent hypoxia damages the prefrontal cortex — the brain region responsible for attention, executive function, and emotional regulation. People with untreated OSA commonly report difficulty concentrating, memory lapses, irritability, and symptoms consistent with depression. These often improve significantly after effective OSA treatment.

Risk Factors for OSA

• BMI above 25 (adipose tissue around the neck narrows the airway)
• Male sex (though prevalence in women increases significantly post-menopause)
• Age over 40
• Neck circumference above 40cm (women) or 43cm (men)
• Retrognathia (recessed jaw or small jaw)
• Family history of OSA
• Regular alcohol use (relaxes airway muscles, worsening obstruction)
• Nasal congestion or structural nasal abnormalities

What to Do If You Recognise These Signs

The standard diagnostic pathway is a sleep study — either a polysomnography (PSG) conducted in a sleep lab, or a home sleep apnoea test (HSAT) for uncomplicated cases. In Australia and the UK, referral is typically through your GP. In the US, many sleep physicians accept direct referrals.

Treatment for confirmed OSA typically involves:

• CPAP therapy — gold standard for moderate-severe OSA
• Mandibular advancement device (MAD) — dental appliance for mild-moderate OSA
• Surgery — selected cases where structural issues are the primary cause

Lifestyle modifications (weight loss, positional therapy, alcohol cessation) are important but rarely sufficient as standalone treatments for moderate-severe OSA. See also our guide to the 5 types of snoring to understand how OSA-related snoring differs from common snoring.

⚕️ Disclaimer: This article is for informational and educational purposes only. It does not constitute medical advice or a substitute for professional diagnosis. Obstructive sleep apnoea is a medical condition. If you suspect you may have OSA, please consult a qualified healthcare professional promptly.