Ever happened with you?

Ever happened that you get haunted by a person in your dreams every night! You know that person though & that person always comes in your dreams...

Can anyone tell me why does it happens??
Thanks for answering!
Update: Edit-By haugnting i mean,that person always comes in your dreams..,and just you cant get that person out of your head..
Update 2: oops sorry for the mistake,its "haunting"
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