There aren't clear answers here. These theories are really hard to prove and they lead to some spicy debates. We don't know what dreams are doing for us just on their own, like the act of dreaming. What can be really helpful is what we do with them when we're awake. So I think it's really a benefit not during the dream, but after you're waking up and having an intensified version of your waking life anxiety. It's clearer because it's intensified so the dreams can help to get a new viewpoint.