What is a dream according to scientific facts? Why do some unknown late people appear in a dream?
You dream of what you have more or less subconsciously perceived for an unspecified amount of time.
This puts your subconscious together into a dream sequence during the night.
Try to read some scientific articles about:
Why We Dream What We Dream
Incidentally:
Did you know, that dreams are very important for our wellbeing.
If one awakens a person under all the dream sequences, the person will eventually behave like a frenzy.
Do the same thing with a person between the dreams, the person will just feel unrested
The above was done under controlled conditions by scientists and doctors at a Danish Hospital
-Erik Piculell