Do you know why humans snore? Or how a cat sees in the dark? Have you ever heard of a flower that blooms only at night? The answers to these nighttime mysteries and more are revealed in this introduction to the science of night. There's a whole world of activity going on in the world in the dark, and even inside us, when our bodies and brains seem to be quiet and still. This book investigates the big questions about what happens at night, from why we dream to why night exists at all. With each chapter tackling a different topic, young readers will uncover everything there is to know about human sleep, nocturnal creatures, all kinds of plants and the objects in the night sky. Along the way, they'll learn fascinating facts about snoring, animal adaptations, lunar eclipses and tons more -- even plants that do math overnight!