Sleep apnea and driving: how to get diagnosed and stay safe
How untreated sleep apnea raises crash risk and how treatment can cut it sharply
You go to bed on time, sleep through the night, and still wake up exhausted. You doze off watching TV. Your partner complains about your snoring. On the drive to work, you catch yourself drifting. These can be signs of obstructive sleep apnea, a common and often undiagnosed condition that makes driving more dangerous.
The good news: sleep apnea can be treated, and treatment makes a big difference on the road.
What sleep apnea is
In obstructive sleep apnea, the airway in the throat collapses or narrows during sleep. Breathing stops or gets shallow for 10 seconds or more, many times a night [1]. Each time, the brain partly wakes to restart breathing. Most people do not remember waking. But their sleep is broken, and they feel tired during the day.
How it affects driving
A review of 10 studies found that drivers with sleep apnea had about 2.43 times the crash risk of comparable drivers without it [2]. Heavier body weight was linked to higher crash risk among people with sleep apnea [2].
You do not have to fall fully asleep to crash. Sleep apnea can cause slower reactions, poor focus and short lapses called microsleeps.
Warning signs
Talk to your doctor if you have several of these:
- Loud snoring most nights
- Someone has seen you stop breathing, choke or gasp in your sleep
- Feeling very sleepy during the day, even after a full night in bed
- Morning headaches
- Trouble focusing or remembering
- Waking up often to urinate at night
- High blood pressure
- A large neck size or being overweight
Doctors often use a short questionnaire, such as STOP-Bang, to judge your risk.
Warning: If you have ever fallen asleep while driving, or nearly did, stop driving until you talk with a doctor. Ask for a ride or use another way to get around in the meantime.
How testing works
Home sleep test. For many adults, a doctor can order a home test. You wear a small device overnight that tracks your breathing and oxygen levels.
Sleep lab test. Some people need an overnight study in a sleep center, where technicians track brain waves, breathing, heart rate and movement.
Results show how many times per hour your breathing stops or gets shallow. That number helps decide how severe the apnea is and which treatment fits.
Treatment options
CPAP. A CPAP machine sends gentle air pressure through a mask to keep the airway open. It is the most common treatment. Research pooling nine studies found that drivers’ crash risk fell by about 65 to 78 percent after starting CPAP [3]. The studies were observational, so the true effect is not certain, but the drop is large. Daytime sleepiness improved after just one night of CPAP, and driving simulator scores improved within about 2 to 7 days [3].
Oral appliances. A dentist can make a mouthpiece that holds the jaw forward. It works for some people with mild to moderate apnea.
Weight loss. Losing weight can reduce or even resolve sleep apnea for some people. In December 2024, the FDA approved the first medicine for moderate to severe obstructive sleep apnea in adults with obesity [4].
Other options. These include sleeping on your side, surgery and an implanted device that keeps the airway open.
Make CPAP work for you
Many people struggle with CPAP at first. Most problems can be fixed:
- Try different mask styles until one fits comfortably
- Use a humidifier to prevent dry mouth and nose
- Ask about pressure settings that ramp up slowly
- Use it every night, for the whole night
- Clean the equipment as directed
A common goal in sleep medicine is using CPAP at least 4 hours a night on most nights. More is better.
Commercial drivers
Sleep apnea is common among truck drivers. A study sponsored by federal regulators found that 28 percent of commercial truck drivers had mild to severe sleep apnea [1]. Commercial drivers should read our guide to the CDL medical card and sleep apnea.
Checklist: sleep apnea and safe driving
Checklist from Safety Behind the Wheel Foundation
- I asked my doctor about my snoring and daytime sleepiness
- I completed a sleep test, if my doctor recommended one
- I use my treatment every night
- I bring my CPAP on trips
- I do not drive when I feel drowsy
- I follow up with my doctor if symptoms come back
Frequently asked questions
Do I have to tell the DMV I have sleep apnea?
Rules vary by state. Most do not require reporting treated sleep apnea for regular licenses. Commercial drivers face federal medical standards. Ask your doctor.
Can thin people have sleep apnea?
Yes. Weight is a major risk factor, but jaw shape, a large tongue or tonsils, family history and age also play a role.
If I use CPAP, can I drive normally?
Many people feel much more alert within days. Keep using it nightly and watch for drowsiness. If you still feel sleepy, tell your doctor.
Related articles
Sources and further reading
- 1Federal Motor Carrier Safety Administration. “Driving When You Have Sleep Apnea.” fmcsa.dot.gov/…/driving-when-you-have-sleep…
- 2Tregear S, Reston J, Schoelles K, Phillips B. “Obstructive Sleep Apnea and Risk of Motor Vehicle Crash: Systematic Review and Meta-Analysis.” Journal of Clinical Sleep Medicine, 2009. pmc.ncbi.nlm.nih.gov/articles/PMC2792976
- 3Tregear S, Reston J, Schoelles K, Phillips B. “Continuous Positive Airway Pressure Reduces Risk of Motor Vehicle Crash among Drivers with Obstructive Sleep Apnea: Systematic Review and Meta-analysis.” Sleep, 2010. pmc.ncbi.nlm.nih.gov/articles/PMC2941424
- 4U.S. Food and Drug Administration. “FDA Approves First Medication for Obstructive Sleep Apnea.” December 2024. fda.gov/…/fda-approves-first-medicati…
This article reflects the safety priorities of drowsy driving prevention and sleep health. It is general education, not medical advice. Talk with your doctor about testing and treatment. Reviewed November 2026.
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