How does sleep apnea detection work on the Apple Watch Series 11?

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The Apple Watch Series 11 includes FDA-cleared sleep apnea detection that identifies signs of moderate to severe obstructive sleep apnea in adults without a prior diagnosis.

How It Works

The watch uses its accelerometer (motion sensor) to detect tiny breathing movements during sleep. When breathing pauses or becomes shallow, these movement patterns change. The watch identifies these disruptions over time.

The 30-Day Detection Process

1. Wear your watch to sleep for at least 10 nights over 30 days
2. Each night is categorized as "normal" or "elevated" breathing disturbances
3. If 5 or more nights show elevated disturbances, you receive a notification
4. The cycle resets and continues monitoring

Detection Accuracy

• Severe sleep apnea: 89% detection rate
• Moderate sleep apnea: 43% detection rate
• False positive rate: Only 1.5%

Apple calibrated the algorithm to minimize false alarms. A notification warrants serious follow-up.

What a Notification Means

An alert indicates patterns worth investigating, not a diagnosis. Next steps:

1. Review detailed data in the Health app
2. Discuss with your doctor
3. If appropriate, get a formal sleep study for diagnosis

Only a sleep study can diagnose sleep apnea. The watch helps identify people who should get tested.

Who Should Not Use This Feature

Sleep apnea detection is not designed for:

• People already diagnosed with sleep apnea
• Users under 18 years old
• Anyone using CPAP or other sleep apnea therapy

Compatible Devices

Available on Apple Watch Series 9, Series 10, Series 11, Ultra 2, Ultra 3, and SE 3 running watchOS 26 or later.