GoKawiilHatch Sleep Clock review finds placement strongly affects tracking accuracy
A reviewer testing Hatch's contactless Sleep Clock compared its sleep duration and stage readings against an Apple Watch Series 12 and Oura Ring 5, finding duration estimates mostly aligned but sleep-stage data more variable. The device requires precise placement 2 to 4 feet from the sleeper with a clear line of sight, and it only tracks the person closest to it, unlike dual-sleeper systems such as Eight Sleep.