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Published online 11 December 2006 | Nature | doi:10.1038/news061211-2
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Spit could show up sleepiness
Enzyme in saliva linked to sleep deprivation.
You might think it's obvious when someone is sleepy: drooping eyelids, a wide yawn and a nodding head tend to give it away. But researchers have added another layer of precision to the picture, by finding an enzyme that increases with sleepiness.
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