somnambulism Meaning, Definition & Usage

  1. noun walking by a person who is asleep
    noctambulism; noctambulation; sleepwalking; somnambulation.

WordNet

Som*nam"bu*lism noun
Etymology
Cf. F. somnambulisme. See Somnambulation.
Definitions
  1. 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.

Webster 1913