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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It is time to get up.

到时间起床了。

youdao

Boy: (ring... ring) It is time to get up, baby!

电话铃响了宝贝，起床的时间到了！

youdao

In a typical prison, when it is time to get up and go to work or to breakfast in the morning, we ring the bell and we march them out.

FORBES: Q&A: The Prison Warden

Now it is time to get the drains up and start cleaning out the sewage.

CNN: Quest: Guilty bankers should clean toilets

It is time for them to speak up right now, and they will get what they want.

FORBES: Princess Ameerah of Saudi Arabia on the Arab Spring, Education in the Middle East, Women's Rights and More