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.

FORBES: Sleep On Demand

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.

WSJ: More Children With Sleep Problems Seek Overnight Tests

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