dreams n reality

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all of us see dream every night.some people say that the last thing which we think before we go to sleep turn on into our dreams. But i personally have felt that there is no corelation between the two..... so what are these dreams all about????????? there are certain people who can interprete dreams.they say dreams are a major through which our mind warns us or guide us regarding future.... whats the truth????? what are these dreams n how n why do we dream??????? do these dreams come true????????? share your thoughts here regarding your dreams.has any of your dream ever come true?