The beginnings of dreams are always elusive because by the time we begin to recollect our dream-selves the story is already under way. It's not as if the observer is suddenly plunked down in the dream action, but the entire situation including the dream character is suddenly plunked down, and a situation, no matter how sketchy always includes its implicit pre-history. Every and any real or imaginary experience, and the smallest fragment of of such an experience contains this inseparable element of internal horizon. It is of the nature of lived time, as are the invisible seams, the jump-cuts.