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1·He had begun to feel sleepy.

他已觉得困了。《牛津词典》

2·Remember (that) you may feel sleepy after taking the pills.

记住，吃了这些药片之后，你可能会犯困。《牛津词典》

3·It can make people feel sleepy.

它会使人感到昏昏欲睡。

4·When you get enough sleep, you won't feel sleepy.

当你睡眠充足时，你就不会感到困倦。

5·Less sleep can give you dark circles under your eyes and you may feel sleepy during the daytime.

睡眠不足会让你有黑眼圈，白天可能还会感到困倦。

6·Still feel sleepy after getting up?

起床后还觉得困吗？

7·Many students not feel sleepy until much later in the evenings.

许多学生直到晚上很晚才感到困倦。

8·The coming drop in temperature of your body will naturally make you feel sleepy.

身体温度的下降自然会让你感到困倦。

9·Eating a big meal can make you feel sleepy, and it can make you feel uncomfortable and prevent you from sleeping well.

吃大餐会让你感到困倦，这会让你感到不舒服，让你睡不好觉。

10·Go to bed if you feel sleepy.

如果你困了，就睡吧。