Techstination, your destination for gadgets and gear. I’m Fred Fishkin. Oura is a company that has taken a unique approach to sleep and activity tracking … A comfortable, attractive ring with sensors…that needs charging every five days or so. Clearly a winner. It communicates with an app that gives you detailed sleep and heart rate information…and assesses your readiness for the day’s activities. It also tracks your temperature…which has turned it into a tool used by the NBA and others…for preventing the spread of Covid-19. CEO Harpreet Singh Rai…says a published study of wearers found..