Why do we need sleep? How much sleep is enough? What is sleep? What happens when we don't get enough? We spend about a third of our lives asleep - it plays a crucial role in our health and wellbeing. References to sleep abound in literature and art, and sleep has been recognized as fundamental to th[...]

The new world of chronobiology is popular science at its most exciting: understanding how the seasons regulate the life of every human, plant and animal on Earth. This book explains why the seasons occur, the impact of seasonal change and how organisms have evolved to anticipate these changes.[...]