I set up that I sleep from 12am to 5am that is my usual time. But Fenix 3HR and Garmin Connect "believe" that I go to sleep around 10 pm when I usually sit down to answer e-mails and plan my next day.
See the graph:
Around 10 am I sit at my desk and the software decided that I'm "asleep" and even in "deep sleep". When around 12 am I get from my desk it decided that I "woke up".
This is not my first tracker with sleep tracking feature but I haven't had this problem before.