the GNU version of the Collaborative International Dictionary of English
n. A somnambulist; a sleepwalker.
The Century Dictionary and Cyclopedia
n. A sleep-walker; a somnambulist.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. someone who walks about in their sleep
Word Usage
"An exhausted proprietor at the head of his waiters, crazed with sleepiness, eventually succeeds in driving these noctambulist apostles into the streets."