A study in rats suggests that individual neurons take a nap when the brain is forced to stay awake, and that the basic unit of sleep is the electrical activity of single cortical neurons. See Article p.443
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Colwell, C. Sleepy neurons?. Nature 472, 427–428 (2011). https://doi.org/10.1038/472427a
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DOI: https://doi.org/10.1038/472427a
