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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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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CPAP masks have become much more comfortable than in years past, doctors say. But most of the time, they're probably not the first thing to try for sleep apnea. hide caption

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