Oura’s sleep-tracking claims are facing a legal challenge over how accurately a smart ring can tell whether someone is awake, dreaming or in deep sleep.
The complaint, filed Thursday, Aug. 20, in the U.S. District Court for the Northern District of California by Clarkson Law Firm, was brought on behalf of California resident Madison Surber. She says she paid $513.68 for an Oura Ring in 2025 after relying on the company’s marketing claims.
The lawsuit challenges Oura’s claims that its rings can provide sleep-stage tracking with up to 95% accuracy compared with clinical sleep labs. It argues that accurately identifying sleep stages requires…
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