Let's-Read-and-Find-Out Science (4) : Sleep is for Everyone 自然科学启蒙:如果我们不睡觉（人体）

This series of books gradually introduces basic concepts of natural science to kids through vivid pictures and simple language that satisfies kids' needs to understand the scientific world. Many of the books contain simple activities for children to do. Everyone needs sleep. No one can go long without sleep. Some scientists have decided to experience it for themselves and see what happens if you don't sleep.