I've got the same problem with my Forerunner 235. I disconnected and reconnected my watch to the app and was able to get 1 night of sleep tracking, but as soon as I turned off my heartrate monitor it stopped recording again. So frustrating! I hope that they can get an update to fix this. It's the third or fourth time I've run into the issue in the year and a half that I've owned my garmin. I love being able to track runs, but I need this to also work as a fitness tracker and right now that's not going so well..... Come on, Garmin!
