Included were 5614 subjects who underwent overnight polysomnography, in which brain wave activity is observed overnight during various phases of sleep, and were then followed for 8 years.

• 该研究对5614名受试者进行了多道睡眠图检测并随访8年，多道睡眠图是对大脑夜间睡眠的多个时相的脑电波进行客观监测记录。