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I don't know how good professional tracking is, but I can tell you that I definitely get useful information from my Oura ring that has lead to an improvement in my sleep. Many small things, but the obvious one is how much even a drink or two of alcohol is affecting sleep for half the night.

Obviously won't help with tracking leg movements, though. Just for a quick confirmation I'd recommend a web camera, but there won't be statistics from it.

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