Suppose last night you had two dreams. In one, God appears and commands you to take a year off and travel the world. In the other, God commands you to take a year off to go work in a leper colony.
Which of those dreams, if either, would you consider meaningful?
Or suppose you had one dream in which your friend defends you against enemies, and another dream in which that same friend goes behind your back and tries to seduce your significant other? Which dream would you take seriously?