Turandot out Turandot's command: "Cosi comanda Turandot" – "This night, none shall sleep in Peking! The penalty for all will be death if the Prince's name is not discovered by morning". The Prince waits for dawn and anticipates his victory: "Nessun dorma" – "Nobody shall sleep!" Ping, Pong, and Pang appear and offer the Prince women and riches if he will only give up Turandot ("Tu che guardi le stelle"), but he refuses. A group of soldiers then drag in Timur and Liù. They have been seen speaking to the Prince, so they must know his name. Turandot enters and orders
Neuroscience of sleep in the ventrolateral preoptic area and parafacial zone, as well as other sleep-promoting neurons in distinct brain regions. The need and function of sleep are among the least clearly understood areas in sleep research. When asked, after 50 years of research, what he knew about the reason people sleep, William C. Dement, founder of Stanford University's Sleep Research Center, answered, "As far as I know, the only reason we need to sleep that is really, really solid is because we get sleepy." It is likely that sleep evolved to fulfill some primeval function and took on multiple functions over time