Its definately possible mate!!
When my cousin died a few years ago, his brother was In the waiting at the hospital having a coffee, It was 2am, and he said my cousin who died came into him and said look after Sara, and tell her I had a great time at the Dolphin. This was the restaurant that they went too the weekend before he had a brain haemmorage and his brother didnt know anything about it. Its never happened too me, but there are too many occurences where the facts cannot of been coincidence.