Quoted: These findings “challenge our ideas about what sleep is,” says Benjamin Baird, a postdoctoral researcher who studies dreams at the University of Wisconsin–Madison and was not involved in this study. Sleep has classically been defined as unresponsiveness to external environmental stimuli—and that feature is still typically part of the definition today, Baird explains. “This work pushes us to think carefully—rethink, maybe—about some of those fundamental definitions about the nature of sleep itself, and what’s possible in sleep.”
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