NOVA: Mysteries of Sleep Like virtually every other animal, humans need sleep to survive. But why? What do we gain from spending nearly a third of our lives in such a defenseless state? And what's at stake if we sleep poorly? The functions of sleep have long been something of a mystery. But now scientists are peering deep into the brain to see what happens while we snooze. One ...。纪录片《共筑未来》从历史和现实两个维度出发,形象阐述“一带一路”重大倡议的深刻内涵,全面表现“一带一路”从“大写意”到“工笔画”的建设历程,以小故事阐释大倡议的方式,讲述了“一带一路”合作共赢的故事,展现了新时代我国推动形成全面开放新格局、建设开放型世界经济、推动构建人类命运共同体的生动实践。。