That humans (and all other species) can never ‘sleep back’ that which we have previously lost is one of the most important take-homes of this book.
The Author of this Quote
![Matthew Walker PhD](/_next/image?url=https%3A%2F%2Fassets.heroic.us%2Fauthors%2Fheadshots%2Fmatthew-walker-phd.jpg&w=640&q=75)
Author
Matthew Walker PhD
Professor of Neuroscience at UC Berkeley, Sleep Scientist at Google and Author of Why We Sleep