<prompt> Which of the following structure is known as the centre for sleep switch?Suprachiasmatic nucleusVentro lateral preoptic areaNeo coexNucleus of tractus solitarius  <response>: 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: Ganongs Review of Medical Physiology, 23rd Edition, Page 236 