When I brought my laptop out of sleep mode and opened my active game, all I saw was a grey screen, nothing happening when I click anywhere. What is this, and how do I fix it? Is there a way to fix it ...
Yes, The Sims 3 will keep your computer awake, even if you have other stuff open. I've fallen asleep before while in CAS and thought, "Oh no! My poor screen." Never close the screen while in game -- it doesn't like it. I forgot and did it once. Things were very weird in that save after that. Exit the game and come back to it, if you need to.