I then have to press escape to pause the game; then it comes back after a few seconds.
I also got a gamepad, which I'm using to play the game now; I was using the keyboard before. I wonder if because I'm not touching the keyboard or mouse, my monitor is going to sleep? Does anyone know of a way to make a gamepad keep the monitor awake?
edit: yeah, it was the gamepad! Moving the mouse woke my monitor up too...