The federal agency that regulates communications across the country wrote that Google made a similar request for its Pixel smartphone in 2018. "As with Google, Amazon describes how it plans to use its Radar Sensors to enable touchless control of device features and functions." 

The capability of the new device "can aid persons with disabilities, as well as to provide sleep-related health and wellness applications," the FCC continued. 

"The use of Radar Sensors in sleep tracking could improve awareness and management of sleep hygiene, which in turn could produce significant health benefits for many Americans," Amazon said in its filing. "Radar Sensors will allow consumers to recognize potential sleep issues."