n. A person who is subject to somnambulism; one who walks in his sleep; a sleepwalker; a noctambulist.
Syn. -- somnambulator. [ 1913 Webster ]

a. Of or pertaining to a somnambulist or somnambulism; affected by somnambulism; appropriate to the state of a somnambulist. [ 1913 Webster ]

Whether this was an intentional and waking departure, or a somnambulistic leave-taking and walking in her sleep, may remain a subject of contention. Dickens. [ 1913 Webster ]