Her/his spirit is still remained in earth. +2 for her/his
That means you need to pray for them were ever they are there not quite happy so send prayers !!!
In the your question .there is a answer that may be ' it is a dream ' so I will happen you known .some times died people will visit us though dreams or some thing like that so it is really possible...
I always thought it was some sort of a sign... I have never had one of those dreams though
At the risk of upsetting Franken Beanz ;-) It means NOTHING ! It's a dream, for goodness sake. There are billions of dreams every night. They mean NOTHING!