13 levels of existence/experience

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>be me
>be dreaming
>I am on top of a building
>then I start to descend
>as I do it I see one person that sometimes looked like a girl, then like an old man and after like an medium age woman
>this person starts to talk to me
>I can't understand what he is saying
>but at some point he talks to me about the 13 levels or layers of existence or experience
>I know that I have to do something with them
>don't know any theory of sociology, psychology or paranormal that mentions something like this

That's my question: what are this levels?