Do you ever have repeat dreams? Do you think it has meaning? Why do we dream?

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I keep on dreaming about numbers. I dreamed about so many 7's. They were everywhere. The next night I dreamed about number 7023. I told someone about the numbers and they went out and played the lottery and won money. I've never played the lottery. I keep on dreaming about 7023, isn't that just strange. The stranger thing is that sometimes my dreams come true. I wonder if 7023 have any significance or is it just subconscience. I dreamed about another number last night but I can't remember that one.