Charge 5 doesn't track my sleep

[MOSBuild1]

Just got a replacement (new) Charge 5 my old one used to track my sleep automatically this one did not -I made sure it was on tightly  heart rate was reading properly. Do I need to set this up in some way - 

Moderator edit: clarified subject.

[DramaQueenDiva]

How long have you had the new device?  It needs at least 2-3 days (possibly even more) to learn your sleep patterns.  There's nothing you need to do on your end.

[MOSBuild1]

Thanks just got 2 days ago they replaced it because old one did same
thing. I’ll give it time to get a pattern. Ty

-------

Thank you for answering- I’ve had 2 days it’s new because old one didn’t record sleep pattern and after numerous tech support help from Fitbit - I’ll give it some time 

thanks agsin

[ManuFitbit]

Good to see you participating in the community @MOSBuild1.

Thanks for sharing with us the inquiry regarding your Charge 5.

In addition to the useful information that @DramaQueenDiva gently provided -the Charge 5 may need some days to collect some information (particularly regarding to heart rate) and provide sleep score, sleep stages and other data-, keep in mind that you must see sleep stages in order to see a sleep score. There are a few scenarios where you might see your sleep pattern (which shows your time asleep, restless, and awake) instead of 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.

If you see sleep stages but don’t see a sleep score, please note that it may take a few minutes for your sleep score to appear. In addition, for better results please try to let the device detect that you're awake or asleep by itself rather than doing it manually and make sure to keep the Fitbit app and the devices' firmware updated to the latest version available.