Matthew Walker is a British author, scientist and professor of neuroscience and psychology at the University of California, Berkeley.

In one experiment he conducted in 2002, he trained people to type a complex series of keys on a computer keyboard as quickly as possible.

He and his colleagues found that those who were tested in the evening first and re-tested after getting a good night's sleep improved their performance significantly without a loss of accuracy compared to their counterparts.

Walker is the founder and director of the Center for Human Sleep Science, which is located in UC Berkeley's department of psychology, in association with the Helen Wills Neuroscience Institute and the Henry H. Wheeler Jr.

[16] He spent four years writing the book,[17] in which he asserts that sleep deprivation is linked to numerous fatal diseases, including dementia.

[21][22] Guzey, together with Andrew Gelman, a statistician at Columbia University, accused Walker of falsification of data in an article published in Chance.

[29][30][31] Markus Loecher, Professor for Mathematics and Statistics at Berlin School of Economics and Law criticised its claims and the veracity of its facts.