I always dream that I killed someone. Even in my dreams, I feel that kind of unwillingness, regret and despair.

It should be that you are exposed to information about this in your daily life, such as watching TV, watching some legal programs or detective novels, which leads to some fragments of consciousness left in your brain. When you are awake, because more consciousness that is more important to your life occupies your brain, those potential consciousness will not gather together, so when you don't dream, there will be no such absurd dream in your brain. When you are asleep, many mainstream consciousness usually recedes, and those subconscious fragments about the murder you saw inadvertently gather together to make you dream about these things. But people are selfish and narcissistic, so the protagonist of murder is you, and murder is a very serious matter, so many functional organs are nervous during sleep, so you wake up tired and worried. So we should relax in our daily life, get in touch with some relaxing things, watch some relaxing programs and listen to some light music. It will be fine! ! ! !