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The changes, which affect more than 700 genes, may shed light on the biological mechanisms that raise the risk of a host of ailments, including heart disease, diabetes, obesity, stress and depression, in people who get too little sleep. “The surprise for us was that a relatively modest difference in sleep duration leads to these kinds of changes”, said Professor Derk-Jan Dijk, director of the Surrey Sleep Research Centre at Surrey University who led the study. “It’s an indication that sleep disruption or sleep restriction is doing more than just making you tired.”
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In the paragraph, what does “host of ailments” refer to?
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The cause of a disease condition.
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The host microorganism.
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A group of disease conditions.
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Medication for some disease conditions.
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