noc·tam·bu·la·tion \ˌnäkˌtambyəˈlāshən\noun ornoc·tam·bu·lism\ˈ ̷ ̷ˈ ̷ ̷ ̷ ̷ˌlizəm\ (-s) Etymology:noctambulation from noct- + ambulation; noctambulism, probably from French noctambulisme, from notambule + -isme -ism 1.: somnambulism 2.: a stroll by night