What term describes someone who walks in their sleep?

The term that describes someone who walks in their sleep is "somniloquist." This term combines the root "somni-" which pertains to sleep, with "-loquist," meaning one who speaks. However, the correct designation for sleepwalking specifically is "somnambulism." While "somniloquist" refers to sleep talking, it can be a point of confusion due to the similarity in terminology, but it emphasizes the involvement of sleep in both conditions.

The other terms listed do not relate to sleepwalking. "Spasmolygmus" refers to spasmodic movements, "spermacrasia" relates to the state of sperm, and "spondylosthesis" pertains to a spinal condition. Understanding the root components can clarify these distinctions, as both "somni-" prefixes indicate a relation to sleep, setting it apart from the other unrelated medical terms.