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We use ballistocardiography (aka a big less sensitive microphone) to pick up movements, breathing and heart rate through the bed sheets.

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Interesting. Has this been compared to EEG for accuracy? I can't imagine it to be very accurate. I'm really curious because as far as I understand anything that isn't EEG is pretty much useless.

Are the sound waves sent to the cloud for processing?

Nope, it's all filtered and processed locally.

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