What is the meaning of Sleepwalker?

A somnambulist; One who walks, or is active, while asleep.

One in a state of magnetic or mesmeric sleep; someone in a hypnotic trance.

A person from whom a voodoo practitioner (a bocor) has taken over control of their mind, making them a zombie who must do the bocor's bidding.

One who goes though life in a state of obliviousness.

Source: wiktionary.org