Well if I dreamt of writing Hamlet it would likely be a lot different from the original, also since Hamlet is in public domain, any reproductions would fall into transformative works. I could see myself making a recording of myself reciting Hamlet verbatim, and no-one could claim it wasn't my own interpretation or the original.
There's one way to argue it wasn't an original, and that would be to claim I am not the same person I was 3 years ago. Although I think it is negligible at best.
Well I'll see what happens next...