I believe that people have a barrier that seperates the dreaming mind to the waking one. As the dreaming mind is inherently creative (It takes disparate things and creates a coherent world) I desire a constant flow of imagery between the dreaming mind and the conscious reflective mind. I believe this dreaming mind continually cretes an imaginary world, it is just the isolation of consciousness that sleep provides that allows us to notice it. The methods I use to keep this flow between these two modes of thinking are calm abiding meditation/zazen, active imagination (see Carl Jung info), free writing during the early stages of drafting and dream analysis. As the unconscious mind/dream cognition uses the language we are given as a structure and is at heart metaphorical a more intimate connection to it can be very helpful to your writing and also give you a closer connection to outside world.