Strange Sleep time recording behavior

My F5 is frequently missing HR recording during sleep time (from minutes to hours)
I noticed today that even the movement data in the same graph of the daily HR is flat to 0 more or less during the sleep time...
But when I go to Sleep data and switch from sleep phases to sleep movement there are a lot of spikes....
Some pictures to explain:

And

0 TrippyZ over 7 years ago

Try rebooting watch. The second chart shows wrist movement, not HR.

0 Ma73ko over 7 years ago

Try rebooting watch. The second chart shows wrist movement, not HR.

I usually reboot the watch before going to sleep, with random result.
I know that second chart show movement, but what is strange is that in the first chart no movement has been detected (light blue curve under the hr graph) while at the same time in the sleep chart movement has been detected.... one of the two is wrong or are these chart recording different movements....

0 TrippyZ over 7 years ago

The timelime/diario chart never shows movement for the sleep state.

0 Ma73ko over 7 years ago

The timelime/diario chart never shows movement for the sleep state.

I can't buy this (tonight chart... some movement is there):