do you know the meaning of our dreams???

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I had a friend who always share his dreams on me...he told me that in his dreams he was being killed by someone and now his scared if it would really happen?. Another one is my sister, she's always telling me that she's always having a nightmare because in her dreams, she always saw someone who is dead in front of her? and she's scared of it...Is anybody know about the meaning of those dreams? are dreams would really happen in reality?