I tried to use AutoSleep and it's just too janky and annoying to use though. Being able to trigger alarm early based on sleep cycle stage was a game changer though.
In the beta, noticed this during an afternoon nap. I didn't think how that was new until after I read an article on it. Seems like such a natural feature.
It doesn't record the same, just a shaded bar that covers all the three sleep stages at once.
Wonder if they'll add trends for how frequent naps are occurring.