Not recognizing my apartment

It was Sunday and I decided to go to the mall to pick up some things that I needed. Everything went fine at the mall. The problems didn't start until I arrived home. I drove home from the mall, pulled into my driveway, put the key in my door and entered my apartment. I took off my coat and put my pocketbook down, went into the living room and I sat on my couch. All of a sudden, I felt very strange. It was as if I didn't recognize the inside of my own apartment, yet I have lived here since Nov. 2008. I just put on my tv and I just relaxed. After a while, I slowly started feeling much better and my apartment no longer felt strange to me. I guess I was in the fog!