There is a device called "holter" that you wear for a day and it measures your BP repeatedly, even during the night. https://my.clevelandclinic.org/health/diag

There is a device called "holter" that you wear for a day and it measures your BP repeatedly, even during the night. https://my.clevelandclinic.org/health/diagnostics/16330-24-hour-ambulatory-blood-pressure-monitoring https://my.clevelandclinic.org/health/diagnostics/16330-24-h... I have worn a holter several times. I had better results than in a doctor's office. It seems to be a classical case of white coat syndrome.