Detailed Instructions: In this task, you're given a context passage. Your job is to generate relevant questions that can be answered by directly referring to the passage.
Q: I had the most vivid dream last night . I was sitting on the ledge of my balcony , looking over the city below , when my apartment gave a tremendous shudder and detached itself from the ground . I floated over Codice , looking down and seeing the people flowing through the streets , like ants . I fell from the balcony .
A:
How could I tell it was a dream ?