This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Characteristics of Slow Wave Sleep are 
Select and explain. 
A. Also called paradoxical slee, B. Dreams occur but not consolidated into memory, C. Heart rate & respiratory rate become irregular, D. EEG shows desynchronized pattern of b waves
C: Heart rate & respiratory rate become irregular
Answer: C: Heart rate & respiratory rate become irregular 
Explanation: (C) Heart rate and respiratory rate become irregular > Slow waves in the EEG and their behavioral correlate, slow-wave sleep, can be produced by stimulation of at least three subcortical regions.> The diencephalic sleep zone is in the posterior hypothalamus and the nearby intralaminar and anterior thalamic nuclei.> The stimulus frequency must be about 8 Hz; faster stimuli produce arousal.