From a psychological point of view, maybe the information you are concerned about recently is about the end of the world, or there are many mysteries in the universe, which has caused a lot of thinking. Makes you sensitive. You may be worried about the future and the development of the situation, so you have this dream. Don't worry, many of them are the afterimage effect of human subconscious. It's just feedback from a lot of information you absorb. I also hope that you can relax, digest and understand some negative information objectively, and don't cause sleep stress and make you feel uncomfortable.