Sleep trackers detect sleep via a combination of motion, heart rate, and temperature sensors. This is Optimizer, a weekly newsletter sent from Verge senior reviewer Victoria Song that dissects and discusses the latest gizmos and potions that swear they're going to change your life. Opt in fo r Optimizer here. Oura's getting sued. A recently filed class-action complaint against the smart ring maker alleges that the company has duped customers by claiming it can accurately track different sleep stages. A smart ring can't possibly do that, the suit says, because the Oura Ring doesn't directly measure your brain waves. Instead, Oura uses AI models to take advantage of "desperate consumers who struggle with their sleep … by selling fault … Read the full story at The Verge. ...read more read less