For me a lot of this comes down a lot to how interesting my work is at the time. Interesting work keeps me motivated. Pomodoro seems like a reasonable solution

For me a lot of this comes down a lot to how interesting my work is at the time. Interesting work keeps me motivated. Pomodoro seems like a reasonable solution for less interesting work (breaking it down into half hour chunks with a 5 minute reward break at the end). On a more practical note, meditation will help with your attention span and stop you getting distracted as easily. Saying that I am on HN posting responses right now. Anyone who has truly solved this problem probably isn't here. :)