consulting a free book on the subject at the library or google can answer your questions, moron.
To make it simple: dreams are like an ejaculation of the brain; when too many impulses are repressed unconsciously in your everyday life, they need to be released and it happens when you sleep. They do not predict the future, your brain searches in your memory pieces associated to feelings (colors, sounds, smells etc) and pick some of them to produce, reconstruct a "movie" that main goal is to express what you re feeling when awake without being conscious of it. Your dreams always recall pieces of what happened to you in the past -wether it s connoted as being "positive" (what allows you to survie/be happy) or "negative"(what made you unhappy=death/ failure to survive) , you cannot dream about things you never experienced or recorded in your memory.
