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. Nocturnal animals are hunting for food. Plants are using maths (!) to conserve their overnight energy. Celestial objects only visible after dark are shining brightly in the night sky. Even our own bodies and brains are still working to keep us healthy! Amazing as it is, the world doesn't stop just because we've closed our eyes.