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
Key regulators of sleep are located in 
Select and explain. 
A. Hypothalamus, B. Thalamus, C. Putamen, D. Limbic coex
A: Hypothalamus
Answer: A: Hypothalamus 
Explanation: Sleep is regulated by two parallel mechanisms, homeostatic regulation, and circadian regulation, controlled by the hypothalamus and the suprachiasmatic nucleus (SCN), respectivelyr Ref:guyton hall textbook of medical physiology 12 edition page number:711,712,713