Who was that guy?

Yesterday while I was strolling in the mall with my family, I saw a guy but I just could not remember who he was. I was thinking long and hard for a long time but just gave up after sometime. Then suddenly when I woke up today morning, I remembered who he was. It was as if my brain was processing the request in the background through out yesterday night and found the answer and gave it to me today morning. Amazing how our brain works.