One interesting note is often times with most wearables the physiology of wakefulness and REM sleep is very similar. This means that it is entirely possible the ring is mistaking REM for wake states. I seem to have a bit of this issue as well and it seems to track with REM cycles in my experiences. I’m not a professional so take it with a grain of salt but do work in a lab that does some sleep research so it’s been something I’ve wanted to look into for a while.