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?

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？