Choose the correct one-word substitution for:
A person who walks in sleep ___.
Show answer & explanation
Correct answer: B
Explanation
Correct Answer
Somnambulist
Explanation
The question asks for the correct one-word substitution for the phrase "A person who walks in sleep."
The word "Somnambulist" is built directly from two Latin roots: somnus (meaning sleep) and ambulare (meaning to walk). Putting them together, a somnambulist is literally a sleepwalker. Therefore, Option 2 is the correct choice.
The other options are incorrect because they refer to different sleep behaviors or states of mind:
Insomniac refers to a person who suffers from insomnia, which is the chronic inability to fall or stay asleep.
Narcoleptic refers to a person affected by narcolepsy, a neurological disorder characterized by an uncontrollable tendency to suddenly fall asleep at any time.
Daydreamer refers to a person who frequently indulges in pleasant, distracted thoughts or fantasies while awake.
Key Points
Learning Latin roots is a powerful trick for solving vocabulary sections. For instance, knowing "somn-" means sleep helps you instantly identify words like somnambulist (sleepwalker) or somniloquist (a person who talks in their sleep). Similarly, knowing "ambul-" means to walk helps you recognize words like ambulance (originally a walking/moving hospital) or perambulate (to walk through).