the GNU version of the Collaborative International Dictionary of English
n. Somnambulism; sleepwalking; walking in one's sleep.
The Century Dictionary and Cyclopedia
n. Somnambulism; sleep-walking.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. walking by a person who is asleep
Word Usage
"Somnambulism, or, as it has been called, noctambulation, is a curious phase of nocturnal cerebration analogous to the hypnotic state, or double consciousness occasionally observed in epileptics."