Our bodies are governed by a 24-hour biological clock, something all too easy to ignore in a world where we push our daily routines – from work to socialising and exercise – into the dark. Learn how to live a healthier, sharper life using your body clock with Russell Foster, director of the Sleep and Circadian Neuroscience Institute, head of the Nuffield Laboratory of Ophthalmology at the University of Oxford and author of Life Time: The New Science of the Body Clock and How It Can Revolutionise Your Sleep and Health, who shares his own studies and insights from an international community of sleep scientists to illustrate the surprising effects the time of day can have on our health.