Take some time off from work (Tip 19)

[pioneer]

Stop right now. Stand up and move away from your computer. Well, read this article first, then do it. A simple thing like getting up from your chair and going to the bathroom can work miracles. Staring at a computer can often lead to brain-dead moments where the mind simply wanders off unconsciously. The idea is to avoid, or at least minimize, these extracurricular midday mental journeys. Going to the window and looking outside allows for a quick fix. (ririanproject.com)