Hello @Barticus, nice to have you here in the Fitbit Community! I'm wondering if the issue is limited only to sleep or is failing to track or log other data?
If the issue is only with your sleep, I recommend to do the following: Try to perform a restart on your tracker. I saw on your Community profile you have a Blaze so the following post will give you some extra help.
If the app was recently updated to the latest version for Android, continue with these steps:
Log out from your Fitbit app and go to your phone settings. Access to the App manager option and look for the Fitbit app in your downloaded apps list. Once you are there, clear the app cache and data and proceed to "Force Stop" the app. Finish the workaround by restarting your phone. When your phone has initialized, go back to your app and try again.
See you around and hope this get you back on track.
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