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Windows PCs can't sleep properly, and Microsoft wants it that way
(www.spacebar.news)
This is a most excellent place for technology news and articles.
The only way for me to keep my desktop off all night is for me to switch off the power supply or unplug it, sleep, hibernate, flat out turning it off, all result in a bright ass screen waking me up at 2am
You can go into the window settings until it to shut down all the way. My computer used to do that too, until I disabled the setting.