sleepwalker

American  

[sleep-waw-ker] / ˈslipˌwɔ kər /

noun

1. 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.

2. 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.

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Etymology

Origin of sleepwalker

sleep + walker