What does it mean if you have a dream about the rapture?

The dream only reflects the dreamer's own interest and study of End-Time prophesy and Scripture. No dreams, no matter how vivid, wide spread or frequent, can be taken as signs that the Apocalypse is about to occur, because numerous Scriptures specifically refute such claims. See Acts 1: 6-7, Matthew 24 and many other texts. Be careful to avoid the temptation to ignore warnings about false prophets.