sleepwalk

[sleep-wawk]
noun
  1. an act of sleepwalking; somnambulation.

Origin of sleepwalk

First recorded in 1920–25; back formation from sleepwalking
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for sleepwalk

sleepwalk

verb
  1. (intr) to walk while asleepSee also somnambulism
Derived Formssleepwalker, nounsleepwalking, noun, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012