A simple permanent marker Sharpie pen will do the trick without causing it to overheat. I've done this in the past to arranger lights I didn't want distracting me onstage, or to the same 'sleeping with the lights on' issue in my old bedroom/studio days!

Here in the lightning capitol of the USA, I keep every single thing I've got on several UPS's, with the high load things (my powered speakers, mostly) on the surge output of the UPS's. I can't recommend this too highly. It's also why I really need power switches on most stuff, as I like to turn off most things if I go out for a while. Things that stay on when you don't really want them on can drain your battery if the power goes out too long, and I prefer to keep most of its' juice for the computer, which stays on most of the time.

After all, who wants to wait to boot up if you have a hankering to post at SZ in the middle of the night?