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
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
I’m not going into detail with the scientific facts. I’ll just say that a dream is a creation of the brain when we are in another level of consciousness known as sleep. I’m not sure what you mean about “some unknown late people” appearing in a dream. If you mean by late that they’re dead, how would you know that they’re dead if they’re unknown to you? I’ve had people in my dreams who are unknown to me—since I see so many people when I’m out in public who are unknown to me, it would be normal for me to dream about faces which aren’t familiar to me. But how would I know whether any of these people were “late” or dead? I’ve also had dreams about people whom have died. These of course are people whom I have known—my husband, mother, and father. They appear in my dreams because they will live on in my memories forever.