The word "somnambulate" is a fancy term for sleepwalking. However, there are several alternatives that can be used to convey the same meaning. "Noctambulate" is the act of walking at night, which can be used as a synonym for somnambulate. "Somnambulism" is another term that refers to sleepwalking. Additionally, "somnambulistic" and "somnambulatory" describe the state of sleepwalking or the act of walking while asleep. In casual conversation or writing, simpler synonyms such as "sleepwalking" or "walking in one's sleep" can be used to avoid confusion or pretentious language.