Sleep tracking discrepancy

[user4KYqfDkRk8]

So I have a galaxy watch 8 classic game just for reference I tested it against my old Fitbit charge 6 to track sleep. I'm getting widely divergent readings from each and I don't know which is known re accurate. I've been having issues with th accuracy or the Galaxy watch which is why I tried this. Any ideas? 

[joejustjoe65]

Almost all the time, always gaps where it's just a blank. I'll reset everything again to factory and setup as a new device.

[nullandvoid]

Do the gaps by any chance coincide with a period of time where you get up for the bathroom?

[harry2763]

This is definitely something I have never seen.