Another theory *contains spoilers*
Upon reading someone's suggestion that Loren could have been drugged:
Possibility: a cult girl is hiding at the station on account of the anniversary of Paymon's suicide. Perhaps the reason sergeant is acting strange in the beginning is because he hears the noises (the cult girl) and gets spooked. The girl manages to drug the food or drink that Loren eventually consumes. Loren falls asleep in her chair. Nightmares ensue. The cult girl, in the meantime, comes to steal Loren's gun, at which point she drags Loren on the floor (or Loren falls in her sleep).
When Loren wakes up and is attacked by the cult girl, remember how she says the whole scene might be a hallucination? So, she does have a passing thought that all prior events were a dream. But she is still under the drugs, so she continues to hallucinate and attacks the hazmat crew. And is still hallucinating when she sees Paymon coming after her to put the bag on her head.
In which case there is nothing supernatural in the story, and it's not even about Loren randomly going into psychosis on the anniversary of her father's death, but rather a plain matter of a failed revenge attempt by the cult girl. It's not even odd then that Loren has hallucinations about Paymon because the place reminds her about her father's death.
Possible?