WatchOS 9 introduces ‘Sleep Stage Tracker’ on Apple Watch; details here

Even though Apple may have the best smartwatch available, it still falls short of the competition in some key aspects, especially when it comes to sleep activity tracking.

WatchOS 9 introduces 'Sleep Stage Tracker' on Apple Watch;  details here

The premium brand is introducing a wide range of workout upgrades with WatchOS 9, along with new watch faces, updated apps and the ability to recognize sleep zones. You will need an Apple Watch Series 4 or later, as well as an iPhone running iOS 16, in order to install WatchOS 9. However, Apple states that not all features may work with all models.

The ability to track your sleep has long been a big deal for iPhone and Apple Watch users. There are plenty of apps that can help you monitor and understand your sleep, but now it’s easier than ever. With WatchOS 9, you can get important information not only about the quantity, but also about the quality of your sleep.

The addition of sleep stages in WatchOS 9 improves the information available from sleep tracking. Apple Watch is able to determine if a user is in REM, central, or deep sleep using inputs from the accelerometer and heart rate sensor. Users can view data about their sleep stages on Apple Watch in the Sleep app. Users can configure their relaxation and bedtime schedules in the Sleep app, and these schedules are synced with all other Apple devices signed into the same Apple ID account.

More detailed information, such as time spent sleeping, combined with additional metrics, such as heart rate and respiratory rate, in graphs comparing different stages of sleep, can be viewed in the Health app available on iPhone. Users will also be able to contribute their sleep stage data to Apple’s Heart and Movement Study through the search app, which will aid in future research in the science of sleep.

Your Apple Watch and iPhone must be in Sleep Focus mode. Every night you can do this manually. You can then get notifications for Wind Down and, perhaps more importantly, reminders to charge your Apple Watch. Apple Watch may not accurately track your sleep stages if you regularly get out of bed or move regularly due to a sleep disorder.

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