Recovery Time increases drastically overnight when using Garmin Index Sleep

Hi,

since I started using the Garmin Index Sleep device, I get good and detailed sleep data – but there is a strange side effect:

  • Every morning after syncing, my recovery time jumps drastically, usually above 60 hours.
  • For example: before going to bed, my Fenix 8 shows a recovery time of around 47 hours. After waking up and syncing, the recovery time suddenly increases to 60+ hours.
  • This behavior causes a major problem: my Garmin Coach Triathlon training plan sessions are cancelled every morning because the watch thinks I am not recovered.

This only started happening after I connected and used the Garmin Index Sleep.

My question: Is this issue caused by the Fenix 8 firmware or by the Garmin Index Sleep firmware?

Thanks in advance for clarification or troubleshooting steps.