Well, I am delighted by the sound of silence after a blackout in the lab lots of PCs stay quiet and the air conditioner says "Fujitsuuu"

don't restart them, its vacation time no-one will notice

I will use the technique of "Restart of demand". While no-one asks for any of them,off they stay,and better for the planet/my brain health

"On Demand" I mean

that's awesome!