Class-action suit claims Oura Ring cannot accurately track sleep stages

Oura, the smart ring maker, is facing a class-action lawsuit over allegations that it misled customers about its sleep-tracking capabilities. The complaint argues that the Oura Ring cannot accurately measure sleep stages because it does not directly monitor brain waves. Instead, the device relies on motion, heart rate, and temperature sensors combined with AI models to estimate sleep data. Plaintiffs claim the company exploited consumers who struggle with sleep by marketing an inaccurate product. The lawsuit highlights broader concerns about the reliability of wearable sleep-tracking technology.