Definition of "sleepwalking" [sleep•walk•ing]

• The act or an instance of walking or performing another activity associated with wakefulness while asleep or in a sleeplike state. Also called noctambulism, somnambulism. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The word sleepwalking does well to be an oxymoron, a combining of two incompatibles, for to walk while you sleep is to go against nature."
• "A study by Travelodge found a seven-fold increase in sleepwalking customers in the past year, to more than 400 cases — almost all of them men."
• "The Jews of Budapest have been described as sleepwalking towards a terrible fate."