My girlfriend keeps dreaming about ghosts. What should I do?

In case of emergency, you can first find a Buddhist scripture or Taoist scripture and put it on the bed. If you feel uncomfortable, you can recite the Buddha's name or Taoist name (Amitabha or Infinite Buddha) silently.

If you go further, you can go to a temple or Taoist temple and ask someone to have a look.

The most fundamental thing is to reflect on what you have done, said and done in the past. Let's not talk about previous lives and future generations here. This kind of thing must be caused by my own situation or mood

Reflect on yourself, but don't underestimate and deny yourself casually.