Berry researches: Nightmares (creature)
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Berry researches Nightmares - creatures, not something you can see while you sleep.
Since first search turns up only nightmare dreams, Berry asks the Librarian about the creature - What is it, where to find it, and what does it do.((Most importantly - is it technically possible to encounter a nightmare in Arabel?))
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The librarians tell them to search through the various books on monsters in the library. And if they cannot find one, then if they should encounter such strange creatures, and various others not in said books, the library would welcome some kind of literary piece detailing such things to fill in the gaps in their stored knowledge.