MIT researchers have developed a device that can monitor people’s sleep postures without cameras or sensors, Engadget reports.

It’s a wall-mounted monitor the team dubbed BodyCompass, and it works by analyzing radio signals as they bounce off objects in a room. As the researchers explained, a device that can monitor sleep postures has many potential uses. It could be used to track the progression of Parkinson’s disease, for instance, since people with the condition lose their ability to turn over in bed.

To differentiate between radio signals bouncing off a body and signals bouncing off random objects in a room, the system focuses on signals that bounce off a person’s chest and belly. In other words, the body parts that move while breathing. It then sends those signals to the cloud, so the BodyCompass system can analyze the user’s posture.

The team trained their creation’s neural network and tested its accuracy by gathering 200 hours of sleep data from 26 subjects who had to wear sensors on their chest and belly in the beginning. They said that after training the device on a week’s worth of data, it predicted the subject’s correct body posture 94 percent of the time.

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