*somnambulistic*

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 ]