For me, that's the solution. Download Destroy Windows 10 Spying - MajorGeeks
Now Win 10 goes tot sleep without any problemen. Before i ran this software it never sleep. Windows was tot busy with...

Can you manually shut down your internet connection and see if your computer goes to sleep. If not, then you have another problem and it is not the hidden activity of windows 10.

When you ran the program, did you see a bluescreen with all the redirections in the host file to 127.0.01?

Here it works on all 3 computers.

Monitor/display will turn off again

After you run this software: Download Destroy Windows 10 Spying - MajorGeeks

Windows can't sleep because it is spying continously. There is nothing wrong...

Search "Destroy windows 10 spying". Sleep and Hibernation works again. Remember: Your computer can't sleep because Windows 10 is always spying at you.