I think my computer has been running a screensaver all night, even though the screen has been turned off. Like, when I move the mouse to awaken it, I'll see the screen saver before it redraws the windows. I don't remember it doing that before, and it keeps it pretty hot all night, instead of running cool (my screen saver is a quartz hog xD). there's even a little notification saying 'this energy saving level will turn the display off before the screen saver is activated'.

Any ideas on why this is happening? has it been happening all along and I've just never noticed?

I'd also accept links to a blank screen osx screensaver xD