unconscious ?

I'd look for a book if I were you.

You can start with this article:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2440575/

It has 48 references from which you can choose.

Impossible is illogical.
Lack of evidence is not proof.
 +  = 

I'm thinking of watching 'Inception' (2010) which might interest you. In it, characters are able to somehow gain access to a person's dreams.

Anyone interested in this topic can find a long thread on the board “Lists and Recommendations”


I do not think that the article plus its references is a good starting point.