Based on the context and the answer, generate a question. 

Context: ! And then the night after that I had another dream that Arashi was going to meet my sister for something and they were going to be at my house . I was so happy I asked my sister to ask them to stay a little longer . I was so busy in my dream that by the time I remembered they were gone and I did n't get their autographs .

Answer:

They had an active imagination



Why did these things happen ?