Charge 5 does often not register all my sleep

[T120]

My Charge5 does often not register all my slep, approx. between 1 and 3 there is a gap. I have had a Charge 3 and 4 with the same problem. The fitbit is set on sensitive. I have a low resting puls, approx. 46, could that be a reason?

Moderator Edit: Clarified subject

[Talahthas]

Welcome to the Fitbit community, @T120!

Sad to hear that you're having an issue tracking sleep with your Charge 5.
To improve accuracy of sleep tracking it's always a good idea to set up a sleep schedule and a sleep goal. Pleas have a look at 'How do I set a sleep schedule in the Fitbit app?' and 'How do I set or change my sleep goal in the Fitbit app?' following the link below:

How do I track my sleep with my Fitbit device? 

You might also try changing sleep sensitivity to get more precise results as described in the help article linked above.

[T120]

Hi, thanks for the suggestions, I read the instructions although not new to me. Funny enough my Charge 5 has registered my sleep ok for the last week.

[Talahthas]

You're welcome, @T120. Thanks for reporting back.
A Fitbit device needs to be able to continuously track your heart rate to give you reliable sleep tracking. So strong hair or tattoo on the wrist you're wearing your device on might impede sleep tracking.