If you are lucky enough to live to 79 (the global average lifespan) you will have spent around 25 of those years (roughly one third of your entire life) asleep. Scientific advances over the past quarter of a century have created a renaissance in sleep research, giving us greater insights into the role and importance of sleep in our lives. To learn more, I spoke to Dr. Matthew Walker, Professor of Neuroscience and Founder & Director of The Center for Human Sleep Science at the University of California, Berkeley.