This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sleep Physiology, Subject name: Physiology
Sleep centre is located in - 
Select and explain. 
A. Basal ganglia, B. Medulla, C. Hypothalamus, D. Cerebellum
C: Hypothalamus
Answer: C: Hypothalamus 
Explanation: Ans. is 'c' i.e., Hypothalamus o Sleep centre - Hypothalamus (Preoptic area of anterior hypothalamus),o Wakefulness centre - Reticular activating system in brainstem & hypothalamus."The sleep centre is in hypothalamus " -- Understanding of medical physiology."The patients who had experienced sleeplessness before dying had brain lesions in the preoptic area of the anterior hypothalamus which came to be known as sleep centre". -- www.thebrain.mcgill.