What effect does this repetition have?
It creates a main idea that the audience can understand, and it establishes Gilgamesh as the main character.
It creates a rhythmic pattern that the audience can follow, and it signals that the audience will hear a new dream.
It creates a new structure that the audience needs to hear, and it shows how long Gilgamesh's journey has been.
It creates a vivid image that the audience can see, and it establishes a more realistic way of storytelling.