How Much Sleep Do You Really Need?

The term sleep disorder may suggest someone tossing and turning all night, but lying awake for hours with insomnia is just one example of many conditions that affect how you sleep and function during the day.
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Credit: Corbis

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Trouble sleeping?

by Gail Belsky

The term sleep disorder may suggest someone tossing and turning all night, but lying awake for hours with insomnia is just one example of many conditions that affect how you sleep and function during the day. In fact, you can have a sleep disorder and not even know it.

Next: How long to snooze

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