Drivers and Sleep Apnoea: DVLA Rules, Your Licence, and What to Expect

If you've been diagnosed with sleep apnoea, or suspect you might have it, it's natural to worry about what this means for your driving licence. This is one of the most common concerns we hear from professional drivers at South Wales Driver Medicals.

The good news? Many drivers with treated sleep apnoea continue to hold their licence and drive without restriction. The key factors are diagnosis, treatment compliance, and symptom control.

This guide walks you through exactly what the DVLA expects, what happens at your medical, and what you can do to protect your licence.

How does sleep apnoea affect your driving licence?

Sleep apnoea is a condition where the walls of the throat relax and narrow during sleep, interrupting normal breathing. The main symptom that concerns the DVLA is excessive daytime sleepiness (EDS), because drowsy driving significantly increases the risk of accidents.

According to the NHS, obstructive sleep apnoea (OSA) is the most common type and can cause repeated episodes of interrupted breathing during sleep, leading to poor sleep quality and tiredness during the day.

For most people, the condition itself is very manageable. The DVLA's concern is not the diagnosis on its own, but whether your symptoms are controlled well enough for you to drive safely. This is an important distinction: a diagnosis of sleep apnoea does not automatically mean you lose your licence.

The rules do differ depending on whether you hold a standard car licence (Group 1) or a professional driving licence such as HGV, LGV, PCV, or bus (Group 2). Group 2 standards are stricter, as you'd expect for drivers operating larger vehicles for longer periods.

DVLA rules for Group 2 drivers with sleep apnoea

If you hold or are applying for a Group 2 licence, the DVLA applies specific criteria when assessing fitness to drive with sleep apnoea.

GOV.UK

The key points from the current DVLA guidance are:

• You must notify the DVLA if you have been diagnosed with sleep apnoea or a sleep disorder that causes excessive daytime sleepiness.
• If you have confirmed moderate or severe OSA with excessive sleepiness, you must stop driving and notify the DVLA. Driving may resume once satisfactory treatment has been confirmed.
• If you are using CPAP treatment and your symptoms are adequately controlled, you may be licensed or relicensed, subject to medical review. The DVLA will typically want confirmation that you are compliant with treatment and that excessive sleepiness has resolved.
• If sleepiness persists despite treatment, the DVLA may refuse or revoke a licence until the condition is satisfactorily managed.

It's worth noting that the DVLA may request supporting medical evidence, including a report from your sleep clinic or consultant. Keeping good records of your treatment and follow-up appointments helps this process considerably.

What happens at your medical if you have sleep apnoea?

When you attend a D4 medical for your HGV or LGV licence, the examining doctor will ask you about any history of sleep apnoea as part of the standard assessment. This is covered on the D4 medical examiner report form.

GOV.UK

Here's what to expect if you declare sleep apnoea:

1. Your diagnosis details: When you were diagnosed, the severity (mild, moderate, or severe), and which type of sleep apnoea you have.
2. Your treatment: Whether you use a CPAP machine, a mandibular advancement device, or have had surgery, and how regularly you use it.
3. Symptom control: Whether you still experience excessive daytime sleepiness. The doctor may use the Epworth Sleepiness Scale, a simple questionnaire that scores your tendency to doze in everyday situations.
4. Compliance data: If you use a CPAP machine, it's very helpful to bring your compliance data. Most modern CPAP machines record usage, and your sleep clinic can provide a printout or summary. This gives the examining doctor objective evidence that you are using the machine as prescribed.

The doctor's role is to record your current clinical picture accurately on the D4 form. The DVLA then makes the licensing decision based on that information plus any additional reports they request.

If you'd like to understand more about what a Group 2 medical involves beyond sleep apnoea, our guide to Group 2 medicals covers the full process.

CPAP treatment and your licence

Continuous positive airway pressure (CPAP) therapy is the most common and effective treatment for moderate to severe obstructive sleep apnoea. It works by delivering a gentle stream of pressurised air through a mask worn during sleep, keeping the airway open.

For drivers, CPAP is often the pathway back to holding a full licence. The DVLA's current position is that drivers who are compliant with CPAP treatment and whose excessive daytime sleepiness has resolved may be licensed or relicensed.

What does "compliant" mean in practice?

There is no single DVLA-mandated number of hours, but sleep clinics typically look for an average usage of at least four hours per night. The more consistently you use your CPAP, the stronger your case.

Practical tips for your medical:

• Bring your CPAP compliance report. This is the single most useful piece of evidence you can have. Ask your sleep clinic for a printout showing your usage over the last few months.
• Bring a letter from your sleep clinic or consultant confirming that your treatment is working and that you do not experience significant daytime sleepiness.
• Be honest about any ongoing symptoms. If you still feel sleepy during the day, mention this to both your GP and the examining doctor. Addressing it proactively is always better than concealing it.

What if you're newly diagnosed?

A new diagnosis of sleep apnoea can feel alarming, especially if your livelihood depends on driving. Here's a practical roadmap:

1. Notify the DVLA. You are legally required to do so. You can use the DVLA's online notification service or complete form SL1. Not notifying the DVLA can result in a fine of up to £1,000, and your insurance may be invalidated.
2. Follow your treatment plan. If your GP or sleep clinic prescribes CPAP or another treatment, start it promptly and use it consistently.
3. Attend your follow-up appointments. The DVLA may ask for a specialist report confirming that treatment is effective.
4. You may need to stop driving temporarily. If you have confirmed moderate or severe OSA with excessive sleepiness, you should not drive until treatment is established and sleepiness has resolved. Your sleep clinic will advise on timing.
5. Book your D4 medical when treatment is established. Once your symptoms are controlled and you have compliance data to show, you're in a strong position for your medical assessment.

The period between diagnosis and relicensing can feel frustrating, but for most drivers it is measured in weeks rather than months. Engaging with treatment early is the best thing you can do.

Dr. Al-Hassan

Medical Director & DVLA-approved examiner

Dr. Al-Hassan is a GMC-registered doctor and the Medical Director of South Wales Driver Medicals. He has performed thousands of DVLA D4 medicals for HGV, PCV, LGV, and taxi drivers, and is known by his patients for being thorough, unhurried, and putting people at ease.

GMC #6487521 · Verify on the GMC register

Sources

1. gov.ukNeurological disorders: assessing fitness to drive(accessed 2026-04-13)
2. nhsSleep apnoea overview(accessed 2026-04-13)
3. gov.ukD4 medical examiner report for a lorry or bus driving licence(accessed 2026-04-13)