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Sleep apnoea symptoms: a complete guide
Obstructive Sleep Apnoea (OSA) is one of the most common and most under-diagnosed sleep disorders in Belgium. Around 1 in 5 adults is estimated to be affected, yet the vast majority remain undiagnosed. During an apnoea episode, breathing repeatedly stops for 10 to 30 seconds - sometimes longer - forcing the brain to trigger a micro-awakening to restart breathing. These micro-arousals can occur dozens or even hundreds of times per night, completely fragmenting sleep without the patient being aware.
This page helps you identify the warning signs, understand their mechanism, and decide whether a medical consultation is needed.
Night-time symptoms
Nocturnal symptoms are often noticed by a bed partner before the patient themselves.
| Symptom | Frequency | Clinical explanation |
|---|---|---|
| Loud, regular snoring | ~95% of patients | Vibration of soft tissues (soft palate, uvula, pharyngeal walls) when the upper airway narrows during sleep. |
| Witnessed breathing pauses | ~75% of patients | Breathing stops lasting 10-30 seconds or more, followed by a loud gasp or snort. The most specific sign of sleep apnoea. |
| Waking with a choking sensation | ~25% of patients | Sudden awakenings accompanied by anxiety or breathlessness, linked to severe apnoea episodes. The patient usually has no memory of these events. |
| Nocturia (waking to urinate) | ~40% of patients | Frequently misattributed to urinary problems. In reality, the negative thoracic pressure during apnoeas stimulates atrial natriuretic peptide (ANP) release, triggering the urge to urinate. |
| Excessive night sweats | ~30% of patients | Repeated activation of the sympathetic nervous system during micro-arousals. |
Daytime symptoms
The fragmented night-time sleep leads to recognisable daytime symptoms - frequently confused with ordinary tiredness or stress.
Chronic morning fatigue
Despite seemingly adequate sleep duration, the patient wakes exhausted. Fragmented sleep deprives the brain of the deep and REM sleep stages required for physical and mental recovery. Present in approximately 90% of apnoea patients.
Excessive daytime sleepiness
Involuntary drowsiness during passive activities (reading, watching TV, meetings) and sometimes while driving. Clinically measured by the Epworth Sleepiness Scale (score â„ 10 = pathological sleepiness). Affects approximately 80% of patients.
Morning headaches
Headaches upon waking caused by nocturnal hypoxia (reduced blood oxygen) and COâ accumulation during apnoeas. They typically resolve within 1-2 hours. Present in approximately 50% of patients.
Concentration and memory difficulties
Difficulty concentrating, frequent forgetfulness, mental fog (brain fog). A brain deprived of oxygen at night operates at reduced capacity the following day. Affects approximately 60% of patients.
Irritability and mood swings
Repeated micro-awakenings disrupt emotional regulation. Patients may become irritable, impatient, or show symptoms of unexplained depression with no apparent link to daily life events.
Dry mouth and sore throat on waking
A consequence of nocturnal mouth-breathing associated with snoring. Often confused with simple dehydration or allergy.
Other associated symptoms
- Resistant arterial hypertension (unresponsive to medication)
- Reduced libido and erectile dysfunction
- Nocturnal gastro-oesophageal reflux
- Unexplained depression or anxiety
- Difficulty losing weight despite efforts
- Restless legs syndrome
Sleep apnoea in women: different symptoms
Sleep apnoea is frequently under-diagnosed in women because their clinical presentation differs from the «classical» male pattern. Women less often report loud snoring or witnessed breathing pauses, and more commonly seek help for atypical symptoms:
- Chronic fatigue - often interpreted as burnout or depression
- Insomnia - difficulty falling asleep or frequent nocturnal awakenings
- Unexplained anxiety and irritability
- Restless legs syndrome
- Unexplained weight gain
Menopause significantly increases the risk of sleep apnoea in women - the loss of oestrogens and progesterone reduces pharyngeal muscle tone and alters respiratory control mechanisms.
Assessing your sleepiness: the Epworth Scale
The Epworth Sleepiness Scale is an 8-item questionnaire covering everyday situations (reading seated, watching TV, being a car passengerâŠ). You rate your likelihood of dozing off from 0 (never) to 3 (very likely). A total score â„ 10 is considered pathological and warrants a medical consultation.
Apnoea severity: understanding the AHI
The Apnoea-Hypopnoea Index (AHI) measures the number of apnoeas and hypopnoeas per hour of sleep. It is the central diagnostic measure, obtained during a home sleep study (respiratory polygraph) or polysomnography in a sleep centre.
| AHI (events/hour) | Severity | Clinical implication |
|---|---|---|
| Less than 5 | Normal | No sleep apnoea |
| 5 to 15 | Mild | Monitoring advised depending on symptoms |
| 15 to 30 | Moderate | Treatment recommended |
| More than 30 | Severe | Urgent treatment required |
For more information on how AHI is calculated and interpreted, visit our dedicated page: AHI - apnoea-hypopnoea index explained.
When to see a doctor
Consult your GP if you regularly experience at least two of the following signs:
- Snoring reported by those around you
- Persistent fatigue despite adequate sleep duration
- Daytime sleepiness (involuntary drowsiness)
- Morning headaches
- Breathing pauses witnessed by a partner
Your doctor can prescribe a home sleep test (respiratory polygraph) or refer you to a pneumologist or accredited sleep centre. To understand the diagnostic pathway, see our page home sleep apnoea test.
If sleep apnoea is confirmed: treatment options
The first-line treatment for sleep apnoea is Continuous Positive Airway Pressure (CPAP). This device delivers a constant flow of air that keeps the airway open during sleep, eliminating apnoeas and their consequences.
In Belgium, CPAP treatment is available via:
- INAMI/RIZIV convention: equipment provided by an accredited sleep centre (device not owned, regular follow-up, eligibility criteria apply). Learn more about CPAP reimbursement in Belgium â
- Purchase from a specialist retailer: for patients who wish to own their own device - immediate start, free choice of model, no compliance constraints. This is VivaRespire's purpose.