Do It Now by Steve Pavlina: "During one of these sacred time blocks, do nothing but the activity that's right in front of you. Don't check email or online forums or do web surfing. If you have this temptation, then unplug your Internet connection while you work. Turn off your phone, or simply refuse to answer it. Go to the bathroom before you start, and make sure you won't get hungry for a while. Don't get out of your chair at all. Don't talk to anyone during this time."