This is the Withings Sleep: a sleep tracker that you can put under your mattress. It can track sleep patterns and breathing disturbances. It can track your heart rate continuously. You can use this with Amazon Alexa. It works with Apple Health, IFTTT, and Google Fit.
You can use this under most mattresses. Your data will be available through the Health Mate app for iOS and Android.
Disclaimer: *Our articles may contain affiliate links. Please read our disclaimer on how we fund this site. As an Amazon Associate, we earn from qualifying purchases.