i'm p paranoid too. i shut my computer off at night and unplug the ac adapter from my psu.
I used to shut it down every night but I stopped because it took too long to boot up. I just sleep/hibernate it instead, pretty much same thing without the startup times. Lets you leave stuff open to resume it as well, and doesn't use as much power.
gaming laptop
That is the problem laptops are NEVER meant to be on for hours and hours on end. Desktops can do it just fine from better cooling
I fear fire.