[Gadget Review] Oura Ring 5 goes where smartwatches fall short

After a near-sleepless night on Aug. 25, I opened the Oura app to find a sleep score of 36 — a blunt number for a night I already knew had gone badly. I had slept for 2 hours and 7 minutes, with 69 percent sleep efficiency and just 17 minutes of REM sleep. The numbers told me little I did not already feel, but they …

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