I agree with Toregone ~ children's fears are generally 'real' so giving them tools to fight those fears has more success than trying to just tell them they do not exist ... making a monster / bad dream catcher or monster be gone spray (lavender water) are a few things I have seen work so the children has the power when the fear comes along to direct it toward something concrete ~ spray their spray or tell the dream catcher to 'get it' and so forth.