Hi all, My 15" Early 2011 MacBook Pro doesn't seem like it can stay on overnight. These past couple of nights, I've been performing tasks overnight, such as downloading games on Steam or uploading 700 photos to Picasa Web. I figured I'd plug the laptop in, put it on a laptop cooler, and change the energy saver settings so that the computer and hard drive never sleeps. (I turn off the display by lowering the screen brightness all the way using the keyboard.) For the past 2-3 nights, I have noticed that either Steam has crashed overnight, and when I try to upload photos or do any other task overnight, I notice in the morning that I'm back at the login window and I am no longer signed in, as if the computer has restarted automatically or simply crashed. I'm running 10.8. Can someone tell me what's going on? It's been really frustrating these past few nights. Thanks!