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That's weird. The fitbit bands that Google still sells do have that. They seem to be having a really hard time making the fitbit acquisition work in many ways so I guess that's not surprising.

I use Sleep as Android on my Pixel Watch 3 for smart alarm. I also found the lack of native smart alarm feature on pixel watches weird.

I prefer using "Sleep as Android" as nothing changes when I change to a different smart watch or android phone.

> I just got a Pixel Watch 3 and find it impossible to understand how they have such an advanced monitoring on so many health aspects, including sleep cycles

The Fitbit integration with the Pixel watches is not great. The Fitbit support is even worse - it actually makes Google's support look decent by comparison, which is really saying something.