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I tried a cheap ($79) Alid thing, I should toss it, it was far from accurate on anything. I once slept for 36 hours straight according to it, truth is 8 days with not a seconds sleep has been common my entire life and that's on top of the strongest sleeping medication the doctor can prescribe.
I've heard though if you spend more money (something I never have) the quality and accuracy improves.
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