WearOS traking: only heart rate and light recorder

Tonight I tried recording sleeping with my Huawei Wath 2 and I see:

  • Heart rate graph
  • Light graph
  • A red line in the bottom part of the hypnogram apart a couple of awakening that are correct

The heart rate graph was incomplete at the beginning (it ended at about the sleeping time) and got “completed” some hourse after I woke up.

Can anybody help?