Tedious, weak, and worst of all "riddled" with errors and oversights. Do not read. I recommend instead Dreaming: A Very Short Introduction by J. Allan Hobson for information about the REM/dreaming stage of sleep, as well as Restful Sleep by Deepak Chopra for readers interested in practical help for improving sleep quality. Unlike Why We Sleep , both of these books are short, direct, readable and clear. Sadly, I also have to spend a brief few sentences on Alexey Guzey's devastating criticisms of this book . Alexey's entire post is very much worth reading, but if you want to see just one glaring example of atrocious academic ethics, you can start with a chart Matthew Walker uses in Chapter 6 to prove a linear relationship between sleep loss and sports injury-- except that he cuts off the part of the chart that disproves his argument . This is childish middle school stuff, way beneath the line of a Berkeley and Harvard professor, a...
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