Good info, thanks.
This past week I've disconnected all externals and one at a time tried sleep. Sleep becomes all over the place nothing points to a solution for my system. I did notice that USB attached devices do cause problems with the sleep. Two I have would be an OWC blu ray USB burner and a Red Dragonfly USB DAC. Turning the burner off but leaving the usb connected was ok but the Dragonfly is a different issue. The Sonnet Echo seemed to work by itself but the Cal digit TS3+ thunderbolt Dock is a different issue. The Cal Digit thunderbolt Elements also. My OWC 4 Bay thunderbolt is off and disconnected . It houses 4 mechanical hard drives. Not going to risk these drives. I only turn them on when needed then unmount when not. Same for the OWC USC-C Dock. Printers are all connected by ethernet, so no issue.
To tell you the truth, I think I've had these sleep issues for years not just because I have the Studio currently.
BTW I'm running Monterey 12.3.1 and still have the issue.