@garmin-dan: HR suddenly dropped to 30 this morning and fired of a low HR alarm. Could this be to the sensor hub updating?
Maybe. but not sure. It happened to me 3-4 times in the past 6 months
I'm getting this many mornings. The HR drops suddenly, right when i wake up
Strange. I'm not a doctor, but I would guess that in reality HR rises during waking up. But maybe it's more because how the watch is on your wrist than a actual HR change?