Last night I put my watch on, went into Sleep Mode, woke up this morning took it out of sleep mode, the screen said Analyzing Sleep, and then deleted it. It was just gone.
So this afternoon I took a nap on my porch. Similar results. I hadn't put it in sleep mode but when I became aware that I had fallen asleep I checked out the sleep data and it showed Analyzing Sleep and then the data disappeared.
Watch software is UTD. Anyone have similar issues?