The Oura Ring sleep tracker retails for $349 and calculates everything from REM sleep to your naps on the couch. But in the world of sleep trackers, is it worth it? WIRED puts it to the test. Here are our other favorites: https://www.wired.com/gallery/best-sleep-trackers/?utm_source=facebook&utm_medium=social&utm_campaign=dhfacebook&utm_content=app.dashhudson.com/wired/library/media/404619159 | WIRED