Which of the following structure is known as the centre for 'sleep switch'?: (A) Suprachiasmatic nucleus, (B) Ventro lateral preoptic area, (C) Neo coex, (D) Nucleus of tractus solitarius
Answer is B. Ventro lateral preoptic area in anterior hypothalamus plays a key role in regulation of sleep. It acts as a sleep generating nucleus thus it serves as a centre for sleep switch. Suprachiasmatic nucleus is responsible for the circadian rhythm. Ref: Ganong's Review of Medical Physiology, 23rd Edition, Page 236