Why We Sleep has garnered a generally positive reception from critics, with Walker admitting to not knowing his book would be a hit amongst readers. The book would go on to make Walker famous in his field of expertise. The book became an international bestseller, including a #1 on the Sunday Times Bestseller in the UK, and a #8 on the New York Times Bestseller.New York Times, Bestsellers, Science It received numerous other reviews, including the Guardian, BBC, NPR, Financial Times, UC Berkeley and Kirkus Reviews. Critics praised the book for Walker's convincing studies on the importance of sleep and its impact on society.
