I have noticed a fatal flaw with garmin and the sleep tracking system. Simply put if your not sleeping within the window you assign the program makes broad assumptions.
I work shifts and often sleep during the day thus my sleep schedule changes. The garmin watch detects I sleep up to 15 hours a day with 1- 4 hours of awake while it says I am sleeping. I have reached out to garmin and been told I need to sleep during the allotted time frame.
So this is my request to have garmin update their systems. It might not be in the right spot but for me it’s a huge flaw in a system that really does not need to be there. I came from a Fitbit which had no issues detecting sleep patterns.
i use the Fenix as a health guide as well as a hiking aid.