I've yet to be stumped with a client's manuscript but my own work is another story. Countless hours of staring at a blinking cursor can bring on an obscene level of restlessness.
Sometimes a bruising run or a long hike under the sun can help, and then other times, I take the words with me.
The speed is slow, the steps awkward, but problems unravel and the story unfolds, allowing me to tackle the glaring flaws. It's only here, when I tell the internal editor in me to take a hike, that the story gets the intensive care it needs.