Reviews
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HR is a know weakness. But sleep stages from what I understand are incredibly hard to detect. Essentially all watches are off. I think DCrainmaker has some good discussion on it (I forget but I think he talked about in the context of his Apple Watch reviews at some point). I think any review of sleep stages in fitness watches should be taken with a huge grain of salt. The fact that the guy doesn’t even acknowledge the limitations of sleep tracking in general is somewhat problematic especially he is considering him as a “scientist”
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@BastMaSVSRS9PP Suunto does only use movement data for sleep tracking. But so does the Apple as well. With a much greater success. But Apple has a lot of money and time invested in those health related things.
He mentioned as well that it is impossible to get the sleep stages data for analysis. And looking at the praised Suunto API you can see that they are not included…