Not every Apple Watch will be able to track your sleep — here are the models that Apple just announced will get the new features in the fall (AAPL)

Business Insider

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· One of the biggest new features coming to the Apple Watch this fall is sleep-tracking, a capability that rivals like Fitbit had offered for years.
· But the new software update will only be available for the Apple Watch Series 3, Series 4, and Series 5, a departure from Apple's previous approach of launching new software...

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