Not sure about the book, but there's 'Paprika' by Yasutaka Tsutsui if you're into the dream manipulation theme. The cover's definitely got that surreal feel to it. And if it's not it, still a solid read anyway!

Alright, so there's a few books that come to mind with dream travel. Check out 'The Dream Master' by Roger Zelazny, might not be dystopian but it's got the dream mechanic down. There's also 'A Scanner Darkly' by Philip K. Dick which has a surreal cover on some editions and deals with altered states of consciousness, though not exactly dream travel. But still might be what you're after.

travel through dreams with a device? yeah, that’s called 'sleeping', ever heard of it? 😂

Could be 'Dreamhunter' by Elizabeth Knox? It's got a dream-related plot and there's this whole Dreamhunter Duet series. Worth a shot?

OMG, it sounds like you're describing 'Otherland' by Tad Williams. It's more virtual reality than dreams but the cover art of some editions is totally surreal and fits that dystopian vibe. The series is a bit of a commitment, but so worth it!

Hey, I'm new to this sub but that description kinda makes me think of something I saw at a bookstore. Don't remember the name but the cover was all trippy with like a man's face melting into a city skyline? Ring any bells for anyone?

r u thinking of inception? ik its a movie but the dream stuff immediately made me think of it lol

This definitely sounds like 'The Lathe of Heaven' by Ursula K. Le Guin. Protagonist has dreams that alter reality and uses a device to augment it. Classic sci-fi, and it fits the dystopian cover theme you mentioned. Definitely check it out again, it's a masterpiece!