How Well Do You Really Sleep? Take This Quiz To Find Out.

It's not just about quantity.

More than a third of Americans don't get enough sleep. Are you one of them? How well do you really sleep at night?

It's not just about the number of hours. If you find yourself waking up in the middle of the night, or if your sleep problems spill into other areas of your life, you probably still have room for improvement.

For one useful, science-backed estimate of your sleep quality, try this questionnaire, called the Sleep Condition Indicator. It was developed by Colin Espie, a professor of sleep medicine at the University of Oxford.

Answer these short questions based on your sleeping patterns of the past month or so, and click through for your results. And check out The Huffington Post's other sleep coverage to see how you can optimize your routine, diet and bedroom for a better night's rest.

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