Voice to skull and dream to skull probably serve a purpose that is largely undocumented: covert hypnosis.
A target may hear in his dreams a voice that tells him what he should say, or what he should buy.
A target may see in his dreams a letter that he reads. Later the target may believe specific claims because he remembers that he read it in a letter although the letter never existed.
© 2017 Cliff Huylebroeck