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Re:Deep Sleep May Be the Best Defense Against Alzheimer’s by crossroadsguy on Sunday May 21, 2023 @10:29PM (#36026770)
The Garmin one is discontinued.

Also, is there a more "layman readable" version of this paper/report?

Re:Deep Sleep May Be the Best Defense Against Alzheimer’s by tallanvor on Monday May 22, 2023 @06:37AM (#36029647)
The Garmin watches have been replaced by newer versions with upgraded sensors. Garmin's tracking isn't perfect, but each version has made small improvements.