Depression can cause poor sleep quality.

抑郁会导致睡眠质量差。

During marriage counseling, he always asks about sleep quality.

在婚姻辅导时，他总是询问睡眠质量。

Each morning, they used a PDA to rank their sleep quality from 0 to 100.

每天早晨，这些妈妈们都用一种掌上电脑来评定睡眠质量，用从0到100的数字来标记。

Exercise promotes sleep and improves sleep quality by altering brain chemistry.

锻炼有助于睡眠，它让大脑产生有益的化学物质改善睡眠。

Sleep apnea not only reduces sleep quality and makes people feel tired during the day.

睡眠窒息症不仅降低了睡眠质量，使人们在白天感觉疲倦。