Zone, sweet spot, zen, meditation, intuition, w/e...definately. Usually I'll have a general idea of where the story is headed, and go along trying to go a certain direction. This writing tends to be o.k., but not really super. Then sometimes there's that spark of inspiration, and even if it takes me away from the plan, I go with it. Vast majority of the time the idea/direction refocus, if not always the writing itself, stays.