The quantity and depth of sleep were assessed by the Pittsburgh sleep quality index (PSQI)at one month interval.

两组以美国匹兹堡睡眠指数（PSQI）为评估手段，来评估失眠症患者治疗前后一个月的睡眠质量。

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The appraisal of sleep quality not only lies on the length of sleep time, moreover also on the speed of falling into sleep and the depth of sleep, as well as whether the sleep structure is reasonable.

评价睡眠质量不仅仅在于睡眠时间的长短，而且还包括入睡的快慢、睡眠的深度，以及睡眠结构是否合理。

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Especially as the in-depth understanding of the different sleep states, the mechanism of memory, and the relationship between sleep and memory increasingly become the focus of the study.

特别是随着人类对睡眠状态研究的不断深入以及记忆机制各方面的深入了解，睡眠与记忆的关系问题越来越成为大家研究的重点。

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Especially as the in-depth understanding of the different sleep states, the mechanism of memory, and the relationship between sleep and memory increasingly become the focus of the study.

特别是随着人类对睡眠状态研究的不断深入以及记忆机制各方面的深入了解，睡眠与记忆的关系问题越来越成为大家研究的重点。

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