In the film Dune (2021), why was this line, "Dreams are messages from the deep." spoken in an alien voice/language? This entire film felt like a dream. What does it mean?
This entire film felt like a dream
There is a popular fans theory (never confirmed) that the whole film is indeed a dream of Leto II, the God Emperor. He was heavily using prescience, and could essentially see into the past and future freely.
"Dreams are messages from the deep." is not a sentence from the books, it was added by the film director, so it might be a hint the above theory is correct.