What does it mean to dream 3 angels?

It means you're probably in some bad remake of a Charles Dickens story (and your name is, most likely, some variant on "Ebenezer").

Assuming the question is not referring to Dickens' A Christmas Carol, there really is not enough information to provide a meaningful interpretation of the dream. "3 spirits" might refer to angels or demons, ghosts or Alcoholic Beverages.