I really like his focus script. However, I think he's treating the symptoms and not the problem. Usually, when I can't focus it just means there's something else that's wrong: 1) I didn't get a good night's sleep, 2) my diet wasn't quite right that day (too much sugar perhaps?) or the previous day, or 3) I've been working too long.

Lack of focus is a signal that something is wrong. In terms of being at home versus at the office, I can have the same lack of focus at the office.