That is an interesting question and one that I actually contemplate. I think the mind (thinking processes and certain awarenesses like love) are separate from the physical brain. Further, Science is proving that matter never dies, and through energy, it only changes form. My question is: Is thought energy and if it is, what happens to thought (the mind), when the body changes form?
There must be an afterlife and if that essence goes to Heaven, doesn't it make sense that the emotion of love would continue to exist and therefore give prudence to a visitation now and then?
I believe that the proof is in love. Why love if there is nothing after our bodies cease to exist?