I too, am glad to have read these posts, so I know maybe I am not crazy.
One night last week my husband and I were laying in bed watching TV. I was thinking about my sister because my niece had just called.
Our cat was laying at my feet, and suddenly he jumped up and looked into the living room like someone was there! He never does this unless he sees someone or something. I looked out, of course, and saw nothing, but I could feel my sister's presence.