Depression can cause poor sleep quality.

抑郁会导致睡眠质量差。

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Among the remaining 35 men and 87 women, 67 percent had poor sleep quality.

在余下的35名男性和87名女性中，67%的患者睡眠质量差。

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Harvard researchers found that a lot of sleep (9 hours or more) is linked with poor sleep quality.

哈佛大学研究员发现，睡得过多(9个小时以上)和睡眠质量差有关。

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