New York sleep center study found that most people in the wake up one or two hours the most sober mind.

纽约睡眠中心的研究人员发现，大部分人在每天醒来的一两个小时内头脑最清醒。

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Sometimes, however, the sleep center is unsuccessful in shutting down both the brain and the body at the same time.

然而，有时候，睡眠中心也没有同时成功的将身体和大脑的内部器官功能都关闭。

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Long-term negative emotional and mental fatigue or interfere with the patient's "sleep center", resulting in sleep disorders.

长期精神过劳或不良情绪等干扰了患者的“睡眠中枢”，造成睡眠障碍。

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"Insomnia is universal, " says Martin Scharf , director of the Tri-State Sleep Center in Cincinnati.

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The biggest red flag is loud, persistent snoring, says Haviva Veler, director of the Weill Cornell Pediatric Sleep Center in New York, which opened in 2012.

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Between ages 3 and 5 "the airway is still small but the tonsils and adenoids are at their largest, " says Jodi Mindell associate director of the Sleep Center at the Children's Hospital of Philadelphia.

WSJ: More Children With Sleep Problems Seek Overnight Tests