Why Do We Sleep?

We spend around a third of our lives sleeping. But how does our body know when to switch off, and what happens during those hours? This book takes you on a fascinating journey through the land of nod and out the other side. * What are circadian rhythms and how do they affect our energy levels throughout the day? * What are dreams for and how do they happen? * What are the different stages of sleep? * Do animals experience sleep the same way we do? With clear texts and bright, distinctive illustrations, this is a great introduction to a subject that has fascinated us since ancient times and that, in our age of endless stimulation, has never felt so timely.

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