All the good programming ideas I have ever had have occured away from a computer. And I don't mean most, I mean all. I still remember my first Eureka moment while waiting for a train to go home. I was so excited about it I almost turned around and went back to the office. Instead I excitedly jotted it down over about three pages of notebook and went in the next day and implemented it.

You have to figure in some time each day away from the screen but still thinking about work in a kind-of background task. And carry a notepad or make voice memos when the light bulb moment strikes.