They mustn't worry; they must sleep; and rest stole into their jaded bones.
他们不用担心，他们必须睡觉，于是他们疲惫不堪的筋骨不知不觉地松弛了。
The researchers found women were more refreshed than men even when they slept the same number of hours and so concluded they must sleep more deeply.
研究人员们还发现，女性和男性睡眠时间相同的情况下，她们的精力会更充沛，由此推论，女性的睡眠要比男性深。
They are alert at bedtime and sleepy when it is time to get up, and this may have nothing to do with how fatigued their bodies are, or how much sleep they must take to lose their fatigue.
他们在睡觉的时候很清醒，到了该起床的时候很困倦，这可能与他们的身体有多疲劳，或者需要多少睡眠才能消除疲劳无关。
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