Is it possible to have a heart rate monitor active, while still having Sonar or Accelerometer set as your sleep tracking sensor?
I have a mi band 2, and even after checking Wearables > Heart rate monitoring, I don’t get heart rate info, unless I also check Wearables > Sleep tracking. But if I select that second option, it seems to ignore input from sonar and accelerometer, and I get a flat reading for the whole night, except for heart rate.