It governs when we become sleepy and when we are more wakeful.

它决定我们何时困倦和何时更加清醒。

You've probably noticed that at night you naturally start feeling sleepy.

你可能已经注意到，在晚上你自然会开始感到困倦。

As adenosine builds up, it increases the urge to sleep, also known as sleep pressure.

当腺起来的时候，它增加了困倦感，也就是睡眠压。

A person might say " I feel sleepy" or " I feel energetic" .

一个人可能会说" 我感到困倦" 或" 我感到精充沛" 。

Efforts to alter your circadian rhythm are likely to end in sleepy frustration.

试图改变你的昼夜节律可能会以困倦和丧告终。

Feeling tired or sleepy also makes us more emotional.

感到疲倦或困倦也会让我们更加情绪化。

43 When he came back, he again found them sleeping, because their eyes were heavy.

43 又来见他们睡着了、因为他们的眼睛困倦。

When I got to work, I always felt very sleepy and I was not happy.

上班时，我总感觉很困倦而且不开。

The call of the wild is also the call of the sleepy.

野性的呼唤也是困倦者的呼唤。

Although napping made no significant difference to feelings of sleepiness, it did help enhance memory.

尽管午睡没有为感觉困倦带来显著差异, 但有助于增强记忆。

Betsy plodded along, her head hanging, her eyes all gritty with fatigue and sleepiness.

贝特西拖着沉重的脚步走着，她的头耷拉着，眼睛里充满了疲倦和困倦。

Do you feel sleepy during the day?

你是否在白天感到困倦？

But if I feel sleepy again, I'll just go to bed.

但如果我又感到困倦，我就直接上床睡觉。

Everyone takes something different or does something different to give themselves energy when they're sleepy.

每个人在困倦时会采取不同的方式或做不同的事情来给自己补充能量。

I want you to watch my finger until you get sleepy.

我想让你一直看着我的手 直到你觉得困倦。

Usually, sibilance implies a mood that sounds threatening, cunning, somber, sleepy, sensual, and mystical.

通常，颤音起来有着一种威胁、狡猾、阴郁、困倦、肉欲和神秘的情绪。

I felt so sleepy that I could hardly keep my eyes open.

36 我感到困倦，几乎睁不开眼睛。

By the time we had finished the first bottle, Simon was very sleepy and very drunk.

当我们喝完第一瓶酒时，西蒙非常困倦，醉醺醺的。

When I feel sleepy, drinking tea gives me energy.

我感到困倦时，喝茶能让我提神。

And so the idea is that you then feel sleepy at the right time in the evening.

这样一来，到了晚上，你就能在恰当的时间感到困倦。