The above is pure superstition, with no scientific basis and no credibility. As the saying goes, think about things during the day and dream at night. We should respect and believe in science in everything, and don't be confused by superstitious ideas. Just keep an optimistic attitude.
Dreaming is normal. Normal sleep process can be divided into deep sleep state and shallow sleep state. If you are in a deep sleep state, brain cells are in a state of inhibition. If the depth of sleep is not enough, some brain cells will be active, and what happens in the brain at ordinary times will be reflected in sleep. There will be all kinds of dreams, talking in dreams, and some will sleepwalk.