My watch says I may have sleep apnea
A sleep apnea notification means your watch saw signs of disturbed breathing over many nights. Here is how it works, what it can miss, and how sleep apnea is actually diagnosed.
From Dr. Kenny Civello, cardiologist and electrophysiologist
Sleep apnea means your breathing stops or gets shallow again and again while you sleep. A watch cannot diagnose it. It can notice a pattern that is worth checking with a real sleep test. A notification is a good reason to talk with your doctor.
It looks over many nights
Apple Watch reviews 30 days of sleep at a time. Samsung needs two nights within 10 days. One bad night does not set it off.
No alert is not a clean bill
In Apple's own study, about 1 in 3 people with moderate or severe sleep apnea got no notification.
It is for people not yet diagnosed
If you already have sleep apnea, the feature is not meant for you. Your CPAP or sleep doctor's tests tell us more.
If an alert comes with fainting, chest pain, shortness of breath, or any other symptom that worries you, call 911. Do not wait to see what your watch says next.
How the watch notices breathing problems
Apple Watch uses its motion sensor. Small movements of your wrist as you breathe show when breathing is interrupted, which Apple calls breathing disturbances. Samsung uses the light sensor to estimate blood oxygen and looks for repeated drops through the night. Either way, the watch is guessing at your breathing from your wrist. A sleep test measures it directly.
Which devices check for sleep apnea
As of October 2026, only Apple and Samsung have FDA cleared sleep apnea notifications you can buy yourself.
| Device | How it checks | What you need |
|---|---|---|
| Apple Watch | Motion sensor, in the background. Needs the watch on during sleep at least 10 nights in a 30 day window. | Series 9 or later, Ultra 2 or later, or SE 3. Age 18 or older, with no sleep apnea diagnosis. |
| Samsung Galaxy Watch | Blood oxygen sensor. You turn it on and track two nights within 10 days, each over 4 hours. | A compatible Galaxy Watch, a Samsung Galaxy phone, and the Samsung Health Monitor app. No sleep apnea diagnosis. |
| Samsung Galaxy Ring | The FDA cleared a ring version in July 2026. | Check whether it has reached your ring and your country. |
| Happy Ring and Withings Sleep Rx | Home sleep tests that a doctor orders. | A prescription. These are tests, not notifications. |
| Oura, Fitbit, Pixel Watch, Garmin, Whoop | Track sleep and sometimes blood oxygen, but have no FDA cleared sleep apnea feature. | Treat their breathing or oxygen numbers as general wellness data. |
Using a ring or watch to track sleep
Sleep scores and oxygen graphs can show trends. They are not built to find sleep apnea. For picks, see Best smart ring for sleep.
How well it works
These numbers come from the studies the companies gave the FDA.
Apple Watch
Caught about 2 of every 3 people with moderate or severe sleep apnea. Fewer than 2 in 100 people without moderate or severe sleep apnea got a false notification. It was built to avoid false alarms, so it misses some real cases.
Samsung Galaxy Watch
The first version caught about 83 percent of people with moderate or severe sleep apnea, and about 12 percent of people without it got a positive result. A 2026 update tested higher, at about 91 percent caught.
What none of them do
None can tell you how severe your sleep apnea is, which type it is, or whether you need treatment. That takes a sleep test.
Why your heart cares about sleep apnea
This is why a heart rhythm doctor pays attention to a sleep alert.
It is common with heart disease
The American Heart Association reports sleep apnea in 40 to 80 percent of people with high blood pressure, heart failure, AFib, or a past stroke.
It strains your blood pressure
Each pause drops your oxygen and jolts your nervous system. Over years, that pushes blood pressure up and makes it harder to control.
It feeds AFib
Sleep apnea is common in people with AFib. In studies, people with untreated sleep apnea had AFib come back more often after an ablation.
Does treating sleep apnea help AFib?
Studies that followed patients suggest that treating sleep apnea with CPAP goes along with less AFib coming back. Randomized trials have not proven it yet. Current AFib guidelines say it is reasonable to screen people with AFib for sleep apnea. Treating it also helps sleep, energy, and blood pressure. See the Sleeping well guide.
How sleep apnea is diagnosed
A real sleep test counts how often your breathing stops or gets shallow each hour.
Talk with your doctor
Bring the notification and your symptoms. Your doctor decides which test fits you.
A home sleep test
For many adults, you sleep at home wearing a small device with a finger clip, a chest band, and a nasal tube for one or more nights.
A sleep lab study
An overnight study in a lab measures more. It is the better choice if you have heart failure, serious lung disease, or another condition that changes breathing, or if a home test was unclear.
Your result
The test reports how many breathing events you had per hour. Under 5 is normal. 5 to 15 is mild. 15 to 30 is moderate. Over 30 is severe.
What to tell your doctor
Check anything that applies. Bring the list to your visit. Nothing you enter leaves this device.
Common questions
My watch never alerted me, but my partner says I stop breathing. Who is right?
Your partner. The watch misses some people with sleep apnea. What someone sees at night matters more than a quiet watch. Tell your doctor.
Can I use the Samsung feature if I have AFib?
Samsung's original feature says not to use it if you have AFib or heart failure, because those conditions can throw off its readings. If you have AFib, ask us about a sleep test directly.
Should I buy a watch to check myself for sleep apnea?
Not if you already have symptoms. A sleep test answers the question faster and more surely. The watch is most useful as a nudge for people who would not otherwise think to ask.
My watch shows low oxygen at night. Is that sleep apnea?
It might be, or it might be a poor reading from a loose band or your arm position. Oxygen numbers from most watches and rings are not built to diagnose anything. Bring the graph to your visit.
Will my watch tell me if CPAP is working?
Not reliably. These features are only for people who have not been diagnosed. Your CPAP machine records how well it is working, and your sleep doctor can read that report.
More on wearables
My watch says I have AFibMy watch ECG says inconclusiveIrregular rhythm notifications, explainedMy watch says my heart rate is high or lowFDA cleared or wellness: what the label meansWhich wearable features are FDA clearedHow I choose the wearables I recommendFind the right wearableBest smartwatch for catching AFibBest smart ring for sleepBest home blood pressure monitorBest personal ECG without a smartwatchBest wearable for an older parentBest wearable for athletesBest wearable without a screenMore on sleep
Sleeping wellThis page is general education for my patients. It does not replace advice from your own doctor. Watch sleep apnea notifications are not a diagnosis. Device names are trademarks of their makers. This page is not affiliated with any of them.
Based on: Yeghiazarians Y, et al. Obstructive sleep apnea and cardiovascular disease: a scientific statement from the American Heart Association. Circulation. 2021. Joglar JA, et al. 2023 ACC/AHA/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation. Circulation. 2024. Kapur VK, et al. Clinical practice guideline for diagnostic testing for adult obstructive sleep apnea. J Clin Sleep Med. 2017. FDA 510(k) K240929 and De Novo DEN230041 decision summaries.