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[JimH]

Last weekend I rebuilt my machine with a new ASUS board (Z590M-PLUS).  There was a little trial and error involved.

I set up Sleep for 30 minutes, but it never went to sleep, even if I commanded it to manually.  It always woke a few seconds later.

Finally tonight, I had the time and patience to dig into it.  I didn't find anything immediately on Google, but I did think about Wake on LAN, and that turned out to be a lucky guess.

In Device Manager, I chose Network > Intel Ethernet, and then Advanced.  At the bottom of the list, there were two settings. 

Wake on Magic Packet

Wake on Pattern Match

They were both enabled.  I turned both off and then tested.  It stayed asleep. 

I went back and changed Magic Packet to Enabled because I use it sometimes.  That also worked.

Don't know why, but sometimes you need to walk quietly away from a problem you've solved, even if you were just lucky.