He had begun to feel sleepy.

他已觉得困了。

《牛津词典》

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》

It can make people feel sleepy.

它会使人感到昏昏欲睡。

youdao

They will begin to feel very tired and sleepy.

VOA: special.2010.02.02

Would you get sleepy, feel nostalgic, suddenly desire some cold soup?

你会困，感到怀旧，突然想喝冷汤？

耶鲁公开课 - 心理学导论课程节选

and you feel so sleepy in a way that you never have before."

VOA: standard.2010.04.30

Professor Jim Horne, of the Loughborough University Sleep Research Centre, said the tendancy to feel sleepy in mid-afternoon was probably a legacy of our distant past.

BBC: How we go to sleep

Coloane Village still has a sleepy feel, while the coast leads on to Hac Sa Beach and Cheoc Van Bay.

BBC: Mini guide to Macau, China