My computer is most of the time on; I turn it off whenever I’m going out or to clean it, or if there’s a storm, obviously. Consoles remain off if I’m not using them, that's a given. I do remember falling asleep a couple of times while playing my N64, leaving it on for the remainder of the night until the next day.
I have battery backups / surge protectors, though, so I rarely worry about power outages when it comes to my computer and consoles.