This is like saying “it’s just metadata, what could it reveal.” As for heart rate and temperature, having this info over time can show: When were you sleeping

This is like saying “it’s just metadata, what could it reveal.” As for heart rate and temperature, having this info over time can show: When were you sleeping, active, potentially emotional? When did a woman ovulate? Is she pregnant now? Did she have a miscarriage? Or maybe an abortion?