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You should check `powercfg lastwake` via PowerShell, and Event Viewer, to determine what wakes up your PC.

I had similar issues, and IIRC, I had to disable wakeups for network adapters in Device Manager.

Thank you for this -- I've been bothered by my Windows PC not sleeping properly for the best part of a year. `powercfg lastwake` indicated the Ethernet adapter and then disabling the option "Wake on Pattern Match" has allowed the computer to sleep soundly.

I've tried lots of things from the first page of google results but I don't think I've tried that. Will give it a shot for sure!

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