Just went ahead and bought a series 5 Apple Watch because of this comment. I have a long tumultuous history with sleep apnea and have been desperately trying everything to figure out how to improve it. I typically sleep 10 hours per day (the sleep apnea is that bad), so I'm going to start recording with the app you've mentioned and see what happens. Thanks so much! Feel free to each out to my email in bio and we can start comparing once i have some data.