Dreams that reflect the waking world aren't that uncommon. Our dreamscapes are often heavily affected by sensory input from the waking world surrounding us while we sleep. Even moreso are we affected by our body-sensory input (telling us if there are pains and changes within our body as we sleep) - body sensory is what teaches us to not wet the bed as we grow up, because the sensation of needing to pee becomes a trigger that wakes us up before it happens.