Sleep-tracker deleted datas

[Filosofalbo]

Good morning everyone!
I started using the sleep recording app about three weeks ago.
Everything was fine until I noticed that many days where I'm sure I'd started the app were now missing from my data history.
With the app, I discovered that, instead of talking, I moan a lot during sleep, almost as if I were being beaten.
The fact that some recordings are missing worries me, and if I need to change app, I need to know it now because I think it's important to investigate this problem I've discovered I'm having.
Reading the forum, I discovered that this problem has already been reported in relation to a time zone, which is why I'm writing from Italy.
Can anyone help me?
Thank you very much <3.

[RiekoC]

Hello @Filosofalbo 

I noticed that you mention that you "started the app". Are you using a Fitbit device or only the Fitbit app to track your sleep? If you're only using the Fitbit app, that could be the problem. I don't recall seeing that the Fitbit app can track sleep without the use of a Fitbit device. 

You might want to review the information on this help page (<-- click) which explains how Fitbit tracks sleep.