instruction:
Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.
question:
nightmare disorder, also known as "dream anxiety disorder", is a sleep disorder characterized by frequent nightmares.
answer:
nightmare disorder


question:
pakistan super league (psl) is a professional twenty20 cricket tournament in pakistan.
answer:
pakistan super league


question:
fjuckby is a village in uppsala municipality, uppsala county, sweden.
answer:

fjuckby