The Fitbit Versa 4 is capable of tracking sleep patterns automatically without the need for manual syncing during the night. It uses a combination of heart rate variability and activity data to determine when you are asleep and in which sleep stages (awake, light, deep, and REM sleep)[4][5]. However, to view the recorded sleep data, you need to sync your device with the Fitbit app after waking up. This ensures that all the data collected during the night is transferred to the app for review[1][5].
If your Fitbit Versa 4 is not tracking sleep properly, it might be due to several factors:
1. Device Fit: Ensure that the device is snug on your wrist, as a loose fit can affect heart rate monitoring, which is crucial for accurate sleep tracking[5].
2. Sync Issues: Sometimes, sync problems can prevent sleep data from appearing in the app. Try manually syncing your device after waking up or restarting the app and Bluetooth connection on your phone[1][5].
3. Sleep Mode: While the Versa 4 tracks sleep automatically, enabling sleep mode can help by reducing distractions during the night. However, this does not affect the actual tracking of sleep patterns[3].
4. Manual Input: If your device is recording some sleep but not all, manually adding sleep times in the app can sometimes resolve the issue by making all recorded data visible[1].
Overall, while the Fitbit Versa 4 can track sleep without needing to sync during the night, syncing after waking up is necessary to view and analyze the data in the app.
Citations:[1] https://community.fitbit.com/t5/Versa-4/Versa-4-isn-t-tracking-my-sleep-data/td-p/5371853
[2] https://community.fitbit.com/t5/Versa-4/Sleep-tracker-help-Fitbit-versa-4/td-p/5654078
[3] https://www.youtube.com/watch?v=nEutsx_BeWc
[4] https://www.reddit.com/r/explainlikeimfive/comments/j2kt3d/eli5_how_do_fitness_trackers_know_that_you/
[5] https://support.google.com/fitbit/answer/14236407?hl=en
[6] https://documents.4rgos.it/v1/static/1153729_R_D001
[7] https://www.reddit.com/r/fitbit/comments/1clgxrx/the_absolute_joy_of_sleep_data_with_my_fitbit/
[8] https://pmc.ncbi.nlm.nih.gov/articles/PMC6579636/