I took a long nap when I got home from the endodontist today since I did not get much sleep the night before. In review the sleep data from Fitbit, I found this:

The tracker though I was asleep from ~10:00 am to 11:30 am, which was right in the middle of my root canals. I can assure you, even though I was lying down in the chair, I was not asleep. As I mention in the previous post, it hurt a lot several times. I though the tracker measure movement and heart beat to determine sleep cycle. Here is heart beat data from the iOS app:

Maybe it was the drop in heart rate from 65 to 60 combined with zero movement. Anyway, I’m going to have to delete the data point.