Ever wonder what happens when you go to sleep at night? Discover all that's still going on in the world after dark, in this intriguing, fact-packed introduction to the science of night. What happens when we go to sleep at night? Now young readers can find out, in this entertaining exploration of the science of night. Lisa Deresti Betik has created a fun, engaging and fact-packed introduction to the science of what happens in the world after dark.