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I'm happy with my Oura ring. Apparently its sleep analysis is on par with gold standard polysomnography (PSG) sleep lab test. https://ouraring.com/blog/new-sleep-staging-algorithm/

Independent studies show that it's among the best but not quite on par with medical grade devices. I suggest to have a look at this channel

Over 300 EUR and a subscription on top of that?!

How does that compare to the cost of a PSG test? Where I live a sleep lab test is pretty expensive so the Oura is an absolute bargain.