Oura lawsuit exposes the inference gap in consumer sleep wearables

A class-action suit against Oura (Surber v. Oura, 26-cv-08686) alleges sleep-stage tracking is roughly 50% accurate — a "coin flip" — despite marketing of 95%. Oura cites peer-reviewed validation studies in rebuttal. The deeper issue: smart rings lack EEG sensors and infer sleep stages from peripheral signals. Whether probabilistic estimates marketed as precise accuracy cross into deception is what the court will weigh.