It is impossible to provide a meaningful interpretation based on a single detail isolated from the rest of the dream. "Four knocks" would mean different things to different people in differing life situations. It could have a religious significance to someone steeped in the Christian tradition ("behold, I stand at the door and knock,") or it could reflect a fear of intrusion by an oppressive authority. Alternatively, it might symbolize "opportunity knocking." The dreamer must consider the emotions associated with the dream and reflect on the source of those emotions in real life.
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Knocking, as in "knocking on the door," in a dream means that the dreamer needs to pay attention and "open up" or be ready for something coming into the dreamer's life.
It only means you're just dreaming. Also it depends what is happening, such as noise in the next room or outside.