The Chinese word 梦游 (mèngyóu), meaning "sleepwalking," is a compound formed through semantic combination, where the first character 梦 (mèng) means "dream" and the second character 游 (yóu) means "to wander" or "to travel." Together, they create a vivid metaphorical description of the condition—literally "dream-wandering"—where a person physically moves about as if acting within a dream. This follows a common Subject-Verb grammatical structure within the word itself (one "dreams" and "wanders"), and exemplifies how Chinese frequently creates precise terms by logically combining existing meaningful syllables to evoke a new, conceptually integrated idea.