watchOS 11 brings sleep apnea detection to Apple Watch Series 9, Ultra 2

Apple has begun rolling out watchOS 11 to eligible Apple Watches, alongside the iOS 18 update for iPhones. The new operating system introduces several features, most notably Sleep Apnea detection. While the Apple Watch Series 10 will come with watchOS 11 pre-installed, the platform upgrade also brings Sleep Apnea detection to select older-generation models, including the Apple Watch Series 9 and Apple Watch Ultra 2.