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The Evolutionary Background
Published online by Cambridge University Press: 06 April 2023
Sleep is a need, just like food, water, or oxygen. If we don’t get enough of it, we die. But right off the bat, we need to qualify this claim a bit. There are at least two forms of sleep documented in human beings: NREM (non–rapid eye movement) and REM sleep. While it is clear that we will, in fact, die without NREM, the case of REM is more complicated. Since this book is also an introduction to the science of dreams, it is worth digging into REM biology right at the start as well, as it is the form of sleep wherein we most often experience vivid dreams. Without REM, it seems, we will likely crumble mentally, but we may not die.
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