Sense 2 not getting sleep registration

[Erik161]

I am using the Sense 2 primarily for sleep registration and stress reduction.

I bought the watch 7 days ago and the sleep registration is completely off.

About half of the time no registration and the rest only about 2-4 hours of sleep

I tried both wrists and tension settings on the watch straps. Loose, tight and very tight

Moderator edit: clarified subject.

[ManuFitbit]

Welcome to the community forums @Erik161. 

Thank you for providing the information regarding this difficulty that you are experiencing with your Sense 2. Thank you for trying to fix the difficulty by your own. 

I recommend considering the following in order to get 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.

For more information, see What should I know about Fitbit sleep stages?

Your Sense 2 may need some days to collect some information (particularly regarding to heart rate) and provide sleep score, sleep stages and other data. Make sure that you've also tried the restart procedure described here and check if you continue to experience the same problem.In case the problem is related to the Fitbit app, please try the following as well: 

• Log out from the app.
• Clear Cache and Cookies for the Fitbit app in your phone's settings.
• Restart your phone.
• Log back in to check if you're able to see your data properly.