Suggest me some books like The Arabian Nightmare Novel by Robert Irwin

The Arabian Nightmare by Robert Irwin is a surreal historical novel set in 15th-century Cairo. It follows the journey of an English traveler, Balian of Norwich, who becomes entangled in a world of "mysticism, political intrigue, and bizarre dreams". The narrative blends elements of fantasy, history, and horror, as Balian experiences a mysterious affliction called the "Arabian Nightmare," which blurs the lines between "reality and dream". The novel's rich descriptions and labyrinthine plot explore themes of perception, identity, and the nature of dreams.

I've read 1984, so similar books are also fine.

I'm interested in reading books that have no distinction between reality and dream.