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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.
Yes depending on the sleep state. Also some power is going to ram to keep it alive. I think for framework it's in the realm of 5% an hour or something like that.
I usually go the hibernation route.
Desktops I sleep to ram, laptops I hibernate to the SSD.