That's interesting. I saw once Timothy Feriss interviewing Neil Gaiman, and it was about focus and whatnot, and Gaiman said: "whenever I'm blocked, I stop, and start doing nothing. I can't watch a movie, read a book, I do nothing. I have only two options: I work or I do nothing - I cannot do anything else. After a little while, things get really boring, and I think 'might as well go back to work' - and that works as a charm.".

I guess that's a very good way of setting your focus straight, to obey your commands, instead of the other way around.