What's the percentage of people who have trouble sleeping?
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What's the percentage of people who have trouble sleeping?
What's the percentage of people who have trouble sleeping?
What's the percentage of people who have trouble sleeping?
在睡眠方面有问题的人占百分之多少呢?
睡眠有障碍的人占多少百分比？
有百分之多少的人有睡眠问题？