Develop sleep rituals which include quiet activities, such as reading, 15 minutes before bedtime.

养成睡觉程序，包括安静的活动，比如睡觉前15分钟阅读。

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The scientists hope that understanding brain scans during sleep will enable researchers to develop tools to keep us asleep when we want to sleep and to wake us up only when it is time.

科学家们希望，在睡眠中对脑部已知功能区域的扫描能够让研究者们开发出一些工具，让我们在想要睡觉的时候保持困倦状态，该起床的时候自然起床。

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One way to boost your energy naturally is develop a balanced sleep schedule.

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Most heart-failure patients also develop periods of broken sleep, known as central sleep apnea.

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"People whose sleep was disturbed were much more likely to develop colds than people who went to sleep, slept all night, and got up in the mornings, " said Cohen.

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