- a person who walks, eats, or performs other motor acts while asleep and is unaware of doing so upon awakening; a person with a disorder characterized by this: A sleepwalker may do something that could cause injury, such as climbing out of a window or walking into objects.
- a person who acts seemingly without awareness, feeling, aim, or will: My parents were sleepwalkers, moving about their world as if oblivious to it and to themselves.
