We can indulge in logical definitions. For example, "spectral" can mean ghost like, as in a specter. But if a ghost is an immaterial being, then how can it appear in a material world? Another damn mystery.
Besides that, there is the miserable subject of eyewitnesses being notoriously unreliable, yet the justice system heavily relies on it.
I've had what are called Night Terrors. Many people have. I would rather they stay away.
This being has her being on paper, and she is lovely.