Since the 9.92 beta firmware was released, I collected the sleep data reported by my Fenix 6X and I noticed that the sleep duration is considering only the REM + Deep + Light sleep, but disregards the awake time. So even if you have some short awake moments during the night, those are not considered part of your sleep session and that seems odd to me. Maybe having a differentiation like Sleep Time vs Actual Sleep would help, otherwise people may be confused. The (so far) collected data is available here http://liviunastasa.com/2020/06/01/garmin-sleep-analysis-discovery-journey/.