I realize this is an old topic but one thing that wasn't covered here is that if you use the reward lights you got from having the sims 3, plant a few of the focused ones near the computer you want to use and then wait till your sim becomes focused before you start playing video games and you will stay focused.. added bonus is you can move them around so that you a) get light into a room and b) get an emotion boost while standing or sitting next to the lights, c) they are handy for parties.