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Hunting for Meaning After Midnight

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Science  09 Mar 2007:
Vol. 315, Issue 5817, pp. 1360-1363
DOI: 10.1126/science.315.5817.1360

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The brain is anything but quiet during sleep. Is it making memories (as is suggested by a new study on page 1426 of this issue of Science), is it searching for insight, or is it up to something else entirely? (Read more.)