High heart rate when not wearing the watch
Why is Heart Rate in Apple Watch showing rates of 113-136 when I'm not wearing the watch, and it's on charge in the other room between 3a-4a? Also it randomly shows a spike at 167 during the day.
Is this a problem with the hardware or the software? Are these known issues, or is there a problem with this device?
Thanks.
MacBook Pro, macOS High Sierra (10.13.2), Late 2016 15" 2.7 GHz i7 16 GB RAM