My first night using it, my deep sleep shot up to 30%. The first couple of days, however, I woke up feeling a bit groggy, even though my HRV was in the 90s (which is high for me) and my deep and full sleep numbers looked good. I suspect, as with my experience with Qualia, there might be a bit of a loading phase for me or the need to half the recommended dose. After those first couple of days, I woke up feeling pretty rested, even though I might not have gotten enough sleep. I would defini...Read more.