Lack of sleep is a major factor in loss of libido.

睡眠不足是导致力必多丧失的一个主要因素。

《柯林斯英汉双解大词典》

It's as yet a challenge to explain the cause-and-effect relationship between sleep and nutrition. There may be a third factor that impacts both of them.

迄今为止，解释睡眠和营养间的因果关系仍是一个挑战。可能存在第三个因素影响这两者。

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As yet a challenge to explain the cause-and-effect relationship between sleep and nutrition, there may be a third factor that impacts both of them.

要解释睡眠和营养之间的因果关系，还有一个挑战，那就是可能有第三个因素对它们两者都有影响。

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For example, private rooms, adopted as a standard for new hospital construction in 2006, have been shown to reduce the spread of infection and decrease the disruption of sleep, an important factor in healing.

WSJ: Children's Hospitals Make Room for Mom, Dad and Diversions

Is it a good or bad idea to give this supplement to kids whose sleep schedules may be thrown off by a time change or some other factor?

CNN: Should your teen take melatonin for help with sleep?

On the other hand, those who aren't getting seven hours of sleep may be kept up by another condition -- anxiety, sleep apnea, or an undiagnosed illness -- that could be the real risk factor.

CNN: Exercise plus sleep may lower cancer risk in women