Not recording Sleep correctyl

Hi,

I've only just got my Fenix 5 and i'm having issues with the sleep function.

It seems to have recorded when I went to sleep and when I woke but there is no levels or movement data. The sleep bar is just grey

Garmin connect online shows - "No sleep data, yet." against last nights sleep.

I've check my heart-rate and that was recorded during the sleep.

I am running 4.16 beta firmware on the device.

Has anyone else had issues with the sleep function or the beta?

Thanks

Alan