Dream

A dream is events experienced in the mind during sleep. If the experience is disturbing or frightening it is classed a "nightmare".

In an alternate universe where the Dominion won the Dominion War, Jake Sisko had a recurring dream where he was alone in an empty white space. Jake suffered the dreams around the anniversary of his father's death. After having them for ten years he discovered that they were actually the Prophets trying to contact him.^[1]