The Client Is Scheduled to Have an EEG to Confirm

The client is scheduled to have an EEG to confirm the presence of a sleep disorder. The client asks the nurse to describe Stage IV NREM sleep. What is the best response by the nurse?

A) "Dreaming occurs here; without dreams you will be irritable and paranoid."
B) "This is the deepest stage of sleep; without it you will be tired and depressed."
C) "This is the lightest stage of sleep, and is profoundly affected by anxiety.
D) "This stage comprises the greatest amount of sleep time, and is important."