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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.
Does suspend to ram drain battery?
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.