Read our full review of the Oura Ring 4. If you’d prefer a more inconspicuous sleep tracker, smart rings are the answer. Taking on the shape and design of a classic ring band, they disguise the tech inside. Among all the smart rings we’ve tested, the Oura Ring 4 is the best. It doesn’t feel too clunky because while it is slim for a smart ring, it’s still thicker than your average ring. Oura’s holistic sleep data approach focuses on long-term patterns and how they affect overall health. If you’re interested in understanding your health beyond sleep, an Oura Ring…