Falling asleep while driving, or waking gasping with chest pain, needs urgent assessment. Do not drive if you are excessively sleepy. Also seek urgent care for severe breathlessness or ankle swelling with morning headaches.
The airway closes repeatedly during sleep, interrupting breathing dozens of times an hour. It causes daytime sleepiness, raises blood pressure and cardiovascular risk, and it is dangerously easy to miss.
If you are considering any operation, this is the condition to have excluded first. Undiagnosed sleep apnoea makes general anaesthesia considerably more hazardous, and it is present in a large proportion of bariatric patients.
During sleep the muscles holding the upper airway open relax. Where the airway is already narrowed — by excess soft tissue in the neck, a large tongue base, enlarged tonsils or a set-back jaw — it collapses, and breathing stops until the brain rouses enough to reopen it.
This can happen dozens of times an hour, every hour, all night. The sleeper rarely remembers it. What they experience is unrefreshing sleep, morning headaches, and profound daytime sleepiness — falling asleep in meetings, at traffic lights, while eating.
The consequences extend well beyond tiredness. Each obstruction causes a surge in blood pressure and a drop in oxygen, and over years this contributes to hypertension, heart rhythm disturbance, heart failure, stroke and worsening diabetes control. Untreated severe sleep apnoea meaningfully shortens life.
For anyone facing surgery it matters acutely. Sedation and general anaesthesia relax the airway further, and opioid painkillers suppress the drive to breathe. An undiagnosed patient can obstruct dangerously in recovery or overnight on a ward. This is why every bariatric programme screens for it and treats it before operating.
General anaesthesia and opioid painkillers both relax the airway and blunt the drive to breathe, which turns a manageable night-time problem into a serious perioperative risk. Patients with undiagnosed sleep apnoea can obstruct dangerously in recovery or overnight on a ward, and this is a recognised cause of avoidable harm after surgery. It is also very common in exactly the group considering bariatric surgery. A sleep study is straightforward, can often be done at home with a portable device, and where apnoea is found, CPAP started before the operation substantially reduces the risk. Any bariatric programme that does not screen for this is cutting a corner that matters.
A partner's account raises the suspicion; a sleep study confirms it.
An observed pause in breathing is worth more than any questionnaire. Ask your partner whether you snore, whether they have seen you stop breathing, and whether you wake gasping. Send that account alongside any sleep study report — including the apnoea-hypopnoea index and the lowest oxygen level recorded, which together grade severity. If a sleep study has never been done and you are considering surgery, arranging one at home before travelling is worth doing.
CPAP works well and works immediately. Surgery for weight helps over time.
A machine delivering pressurised air through a mask holds the airway open during sleep. It is highly effective from the first night, and patients frequently describe the improvement in daytime alertness as transformative. Comfort and mask fit determine whether people persist with it, and support in the early weeks makes a substantial difference to that.
Sleep apnoea improves substantially after significant weight loss in a large proportion of patients, and it is one of the clearest benefits of bariatric surgery. Improvement should be confirmed by repeat testing rather than assumed — stopping CPAP because you feel better, without a repeat study, is a common and avoidable error.
Some apnoea occurs only when sleeping on the back, and simple positional measures help. A custom mandibular advancement device, made by a dentist, holds the jaw forward and is effective in mild to moderate cases and in patients who cannot tolerate CPAP.
Removal of enlarged tonsils, nasal surgery to improve airflow, or procedures on the soft palate and tongue base in selected patients. Results are less predictable than CPAP, and careful assessment of where the obstruction actually occurs is essential before operating.
The apnoea-hypopnoea index and the lowest oxygen level determine urgency and whether CPAP is needed before surgery.
This raises the priority considerably. Untreated apnoea and general anaesthesia are a dangerous combination.
Enlarged tonsils or nasal obstruction may be surgically correctable. Soft tissue crowding from weight responds to weight treatment.
If you have been sleepy for years and never had a sleep study, arranging one at home is the most useful next step — regardless of whether any surgery follows.
Do not drive if you are falling asleep unintentionally. In most countries this also carries a legal obligation to inform the licensing authority.
Photographs taken on your phone are fine. Reports in Arabic, Russian or Bengali are fine — we translate them ourselves.
Because anaesthesia and opioid painkillers relax the airway and reduce the drive to breathe, so a problem confined to sleep becomes a serious risk in recovery and overnight afterwards. Undiagnosed sleep apnoea is a recognised cause of avoidable harm after surgery, and it is very common in patients considering bariatric operations.
With a sleep study. A home test using a portable device recording airflow, oxygen and breathing effort overnight is adequate for most patients and is far more accessible than a laboratory study. It measures how many times an hour breathing is interrupted and how far oxygen falls, which together grade the severity.
It takes some getting used to, and mask fit and comfort determine whether people persist with it. Support in the first few weeks makes a large difference. Most people who stay with it describe the improvement in daytime alertness as substantial and rapid — many notice it within the first few nights.
It improves markedly in a large proportion of patients after significant weight loss, and this is one of the clearest benefits of bariatric surgery. But it should be confirmed with a repeat sleep study rather than assumed. Stopping CPAP because you feel better, without retesting, is a common error that leaves people at continued risk.
Yes. A set-back or small jaw, a large tongue base, enlarged tonsils and nasal obstruction all narrow the airway independently of weight, and sleep apnoea occurs in slim people. If you have the symptoms, ask for a sleep study regardless of your build.
Untreated moderate to severe sleep apnoea raises blood pressure, contributes to heart rhythm disturbance, heart failure and stroke, worsens diabetes control, and meaningfully shortens life. The daytime sleepiness also carries a substantial risk of road traffic accidents, which is why driving while excessively sleepy must be avoided.
Send any sleep study report with the apnoea-hypopnoea index, and tell us what whoever sleeps beside you has observed. If no study has been done and surgery is planned, arrange one first.
Your reports go directly to our medical team. We do not share your records with hospitals until you tell us to.
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Coordinators available 9:00–20:00 IST. We speak Arabic, English, Russian and Bengali.