My Forerunner 255 records my sleep OK, Garmin Connect shows all the right data in the morning when I wake up.
But a few hours later the app claims I didn't sleep at all last night, and all the recorded sleep data that it showed in the morning has disappeared.
It has been doing this since a week or so, before that it remembered my sleep data without throwing anything away.
Is there a way to stop Garmin Connect losing my sleep stats?