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Here are some facts for you

* sleep number beds have sensors in them that detect heart rate

* they do this by detecting pressure differences in the air mattress

* these are effectively microphones, right? and quite sensitive

Do they really detect heart rate through pressure sensors? That seems like it'd have so much noise the data would be unusable. Edit: Looks like they couple it with some fancy statistical analysis to get accurate enough data. Interesting

They acquired Bam Labs' tech to do this.

https://www.crunchbase.com/organization/bam-labs

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