I see a lot of people mentioning less distractions etc. While I agree I think if less distractions is your main reason that is a sign that you are not being assertive enough and not taking control of the situation as much as you should. It sure takes some determination, but hey unplug yourself and let your friends know those are the hours you are working hard and return their calls later. Most distractions really are not that urgent, we just let them distract us. Don't let everyone expect to be able to reach you with a click of a button. Fancy toys and gadgets make it hard, but you lose something more valuable...