Noticed something. The watch automatically took my heart rate every 10 minutes and saved it to the Health app. Starting at 3 am, when I was in bed without interruption from letting the dog out at 2:40am, my heart rate followed a regular trend. Every hour or so, my heart rate would go from a low of 41-44 BPM to a height of 81-97 BPM.
Very interesting to see my sleep stages throughout the night.
Very interesting to see my sleep stages throughout the night.