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Can you say a bit about how you know this? Like are all these trackers you tested compared against polysomnography/EMG? Wouldn't everything of course be not as good as that (since we're treating that as 100% perfect?

How do you know that the certified sleep tech is reporting good results? How do you know that the results have good external validity (i.e. the results are not due to the unnatural sleep study environment with EMG attached and being forced to sleep at a certain time in an artificial bedroom?

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