A Client with a Diagnosis of Insomnia Is Surprised When

A client with a diagnosis of insomnia is surprised when his physician explains to him that his brain is still highly active during normal sleep. Which of the following statements best captures the character of brain activity during sleep?

A) "Fewer neurons in your brain are firing when you're asleep, but they're more synchronized than when you're awake."
B) "While you're obviously less aware of stimuli when you're asleep, your brain is actually more active when you're asleep than when you're awake."
C) "There are four types of brain activity, and actually all of them occur at different stages of sleep."
D) "Your brain alternates between periods of activity and periods of inactivity when you're asleep, and these correspond to your eye movement."