Duke Zhou dreamed that a big black dog wanted to bite me and asked me to kill it with bricks.

Dreaming, whether it is a good dream or a nightmare, proves that your sleep quality is not good. That's because you are tired. Don't think too much about unhappy things during the day. Relax and be happy. Don't think about all kinds of things before going to bed every day. It's easy to have nightmares when sleeping. Don't lie on your side. Don't worry.