Hi there, @Nini46 @Di-Rideau. Welcome to the Fitbit Community Forums. Thanks for bringing this to my attention and for the troubleshooting steps you've tried. I'm sorry to hear that your Versa 4 devices have stopped tracking your sleep data. I understand your concern, I will do my best to help you with this!
I recommend considering the following in order to get sleep stages:
- If you slept in a position that prevented your device from getting a consistent heart-rate reading or wore it too loosely. For best results, wear your device higher on your wrist (about 2-3 finger widths above your wrist bone). The band should feel secure but not too tight.
- If you used the Begin Sleep Now option in the Fitbit app (instead of simply wearing your device to bed). For more information on automatic sleep tracking, see How do I track my sleep with my Fitbit device?
- If you slept for less than 3 hours.
- If your device’s battery is critically low.
For more information, see What should I know about Fitbit sleep stages?
On a side note, I have found that having WiFi turned on on my phone will interfere with syncing of some of the data, sleep is one of those. You may need to wait for a min or two before sync will be successful.
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