Sleep is not a state that isolates us perfectly from our environment: we are able, while sleeping, to hear and understand words. These observations, the result of close collaboration between teams from Paris Brain Institute and the Sleep Pathology Department at the Hôpital Pitié-Salpêtrière in Paris, call into question the very definition of sleep and the clinical criteria for distinguishing between its different stages. They are detailed in a new study published in the journal Nature Neuroscience.
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