How does the person dream of monsters in the head? A combo of toxins like stress, ill treatment, traumatic memories & etc, can create monsters in the head. Sometimes, these monsters come out to play. They may manifest as schizophrenia’s voices, or any other form of abnormality like dreams of monsters.
The monsters in the head are residents 24/7.
If you abuse someone and trigger the chain reaction, you are guilty of inventing the horrible monsters in the head. You should not be too pleased of your handiwork. You never know when those monsters are coming to get you. This means you too, may one day fall into the same trap, and experience your own monsters.