Below is one cool addition to information about how yesterday’s sleep score feature works on older Apple Watch models. In fact, third-party accessories can also work when you provide sleep tracking. Details are here.
Sleep scores are not necessarily tied to Apple Watch’s sleep tracking feature
As Rudrank Riyam of X pointed out, you don’t even need to own an Apple Watch to see your sleep score in the iOS 26 health app:
Additionally, there is no need to install WatchOS 26 on your Apple Watch, as it takes into account the sleep data that Apple Watch (and third-party devices) collects natively isolated from system updates.
This also allows you to retrospectively check your sleep score when your device first measures your sleep. This means that once you install iOS 26 you can see your daily analysis of sleep based on the history of sleep.
Naturally, if you want to get that information correctly on your wrist, you need the Apple Watch Running Watchos 26. This means Apple Watch Series 6 or later, Apple Watch SE 2 or later, Apple Watch Ultra models.
How sleep score works
This feature evaluates sleep based on factors such as duration, consistency in bedtime, frequency and frequency of wake-up, and time spent at each stage of sleep (deep, core, REM).
Once the score is calculated, Apple divides it into categories, comparing each to the user’s average data to make it easier to understand which aspects can be improved.
According to Apple, the new feature was developed based on sleep data from the Apple Heart and Movement Study over 5 million nights of sleep. It was also known by the major guidance of the American Academy of Sleep Medicine, the National Sleep Foundation and the World Sleep Association.
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