The disorder known as _________, or sleepwalking, is believed to occur in about 20 percent of the population at some time in their lives.

Question

Quizplus · Accepted Answer

The disorder described in the sentence is somnambulism, also known as sleepwalking. Therefore, the correct choice is B. Apnea is a sleep disorder characterized by breathing interruptions, narcolepsy is a sleep disorder characterized by excessive daytime sleepiness, and cataplexy involves sudden muscle weakness or paralysis triggered by strong emotions. None of these disorders match the description given in the sentence.

The Disorder Known as _________, or Sleepwalking, Is Believed to Occur