This mechanism probably evolved to make sure starving mammals don\\\\\\\'t go to sleep when they should be foraging for food.

这种机制可能是为了确保饥饿的哺乳动物不要在该去觅食的时候沉沉睡去。

youdao

When you don 't get enough sleep, you become tired and cross. Disease germs attack a tired person more easily than a rested one.

睡眠不足时，你疲倦而且脾气暴燥。与休息好的人相比，疲倦的人更易受到病菌的侵袭。

youdao

Every morning, if I don "t get up, her mother will be bothering me in bed but sleep, and watch TV, play computer."

每天早上，如果我不起床，妈妈就会在被窝里折腾我除了睡觉，还有看电视、玩电脑。

youdao

And,if you wish someone good night, you might say, "sleep tight -- don't let the bed bugs bite."

VOA: special.2009.06.28

Why do we sleep and why don't we--why aren't we always awake?

我们为什么会睡觉,我们为什么不是一直醒着？

耶鲁公开课 - 心理学导论课程节选

You just don't get enough sleep!

你就是会睡眠不足！

苦中有乐的学习 - SpeakingMax英语口语达人

"When people are entering a high-stress period, they don't sleep and don't exercise, but in fact, it should be just the opposite, " says Loehr.

FORBES: How To Run On Fumes

Because I don't sleep, I couldn't bug all my friends, so I went to the internet because when it's night-time here, it's daytime somewhere else.

BBC: Nile Rodgers' battle with prostate cancer

"I put the bedroom in because sometimes I don't sleep very well at night and sometimes I like to rest in the afternoon, " she says.

WSJ: Reformed Bad-Girl Artist Tracey Emin