The Fourth Sleep Research Frontier Forum was held by CEBSIT on March 18, 2011. The theme of this forum is "Sleep - Wake Neural Circuit", focusing on the regulation of sleep - wake behavior by different brain regions and different types of neurons discovered in recent years. More than 40 researchers from related fields participated in this forum. Drs. ZHANG Zhe and LIU Danqian attended the forum. The meeting was hosted by Dr. XU Min, Principal Investigator of the Lab of Modulation of Neural Circuits and Behavior.