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@VernaH Welcome to the Fitbit Community! I recommend performing a restart on your Fitbit Alta (check @CindyFitbit's steps on that post). That should fix the inaccuracies with sleep tracking. You can also track sleep from the app itself on the "how did you sleep" tile. You can also log your sleep manually or edit previous sleep logs for them to be correct on that same tile.
Try that out and let me know how it goes! 
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