https://www.cnet.com/news/vayyar-watches-over-your-smart-home-without-using-a-camera/

"Superman vision" sounds like a useful tool to have when monitoring a smart home. Vayyar claims its sensors have just that at CES 2018, and oddly, the sensors see your home without even using a camera. By using radio waves and a 3D sensor, Vayyar can map where people are in a room. Since it's not relying on ordinary sight, it can even see through walls and smoke.

Vayyar's sensors don't produce an ordinary picture. Instead, you'll see people on a grid, and Vayyar can track their breathing, as well as if they're sitting, standing or laying down. By monitoring breathing, Vayyar can send an alert if someone stops breathing. By monitoring whether you're laying down, Vayyar can know if someone took a fall.