Torn The Enchantress find her dream man he came from her dreams. Her partner her father Lance's boss Lando finds out he is losing her to a dream.
Her father and Lando get help of Sandy, the Sandman to solve their problem and find out how he got to their world.
Also in book Am I Just A Shadow You Drew? When a routine magical event backfires Lance, the Necromancer finds himself in strange world where he discovers he's only a figment of an author's mind.