Rough night? Depending on specific tweaks to their genes, some fruit flies have trouble falling asleep, and others can't stay asleep. Getting too little shut-eye hurts their memory. David M. Phillips/Science Source hide caption

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David M. Phillips/Science Source

How Research On Sleepless Fruit Flies Could Help Human Insomniacs

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About 10 percent of Americans have chronic insomnia. iStockphoto hide caption

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There's more than one reason to aim for a good night's sleep. Charles Taylor/ hide caption

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Charles Taylor/