Schadenfreude refers to dreaming of a sudden disaster for no reason. Generally, people who have such dreams are all because of a sad word.
Worried about dreams coming true. It's just that this coincidence is not common, and even if it does happen, you can't change anything.
Happiness refers to the disaster that happens to others, that is, another building is on fire. Then your dream also indicates that even if something terrible happens, it will not affect your family. What is there to worry about?