SOMNAMBULISM
sleepwalking, somnambulism, somnambulation, noctambulism, noctambulation
(noun) walking by a person who is asleep
Source: WordNet® 3.1
Etymology
Noun
somnambulism (countable and uncountable, plural somnambulisms)
sleepwalking
Synonyms
• sleepwalking (common)
• noctambulism (rare)
• somnambulance (rare)
• somnambulation (rare)
Source: Wiktionary
Som*nam"bu*lism, n. Etym: [Cf. F. somnambulisme. See Somnambulation.]
Definition: A condition of the nervous system in which an individual during
sleep performs actions approppriate to the waking state; a state of
sleep in which some of the senses and voluntary powers are partially
awake; noctambulism.
Source: Webster’s Unabridged Dictionary 1913 Edition