Nightmare Dispelling Spell

From the 太上洞渊神咒经 (Highest Spiritual Abyss Incantation Classic) (Self hypnosis classic?)

夜梦不祥，画在西墙。  
太阳一照，化为吉祥。

Yè mèng bù xiáng, huà zài xī qiáng.  
Tàiyáng yī zhào, huà wéi jíxiáng.

If a nightmare is bad, draw it on the western wall

As soon as the sun shines on the wall, it will transform into good fortune

How do you draw on the western wall of your home? It helps if you have a white plaster.

Why draw?

Drawing or writing about dreams is used to help make sense of them in many traditions. The dreams can hint at deeper fear. The ritual of drawing it on the house is also useful as the house may symbolize the individual’s consciousness or body. The light hitting it bring the fear to light. This can transform a fear into something lucky if the fear is understood and the correct precautions are taken.