I started using the watch on 29 Dec and have noted the last 2 mornings the sleep data changes between me looking at it after wake up and when synced - eg read 7.27 hours sleep and 400 odd calories but synced to read 2.05 hours sleep and 0 calories. Today was 7.20 hours sleep but synced as 3.07 hours, calories didn't change. After syncing, the watch now reads the changed sleep data.
Previously no changes in sleep data between waking up and syncing. Have no idea why or what is causing it. Time between waking up and syncing is no more than 10 to 15 minutes. Has anyone else had/has this issue?