SCIENCE: GENERAL ISSUES. Sleep has its own unexpected and rich story ranging across science, history, literature and philosophy. It's been a cultural battleground between those who see sleep as a gift from nature and those who have seen it as an idle waste of time. In an overcrowded, exhausting 24-hour culture, sleep has become a valuable, rationed commodity. It's something that people are thinking about more than ever before. This bedside-table companion responds to this interest in sleep, providing a mixture of short, browsable pieces and more extended sections. The style is informed, thoughtful and entertaining, in keeping with the subject matter. It is intelligent but playful, quirky and amusing. Any study of sleep has to savor the delight of the long lie-in, the sexual musk of night time; discuss the history of the bed, the origin of pyjamas and how the Elizabethans saw the pillow as a sign of moral weakness and examine why the Italians called the bed the 'the opera of the poor'.