He loved sleeping on ships; he thought that the rocking of the waves rocked him to sleep so he liked doing that.

他喜欢睡在船上,波涛的起伏能使他入眠,所以他乐此不疲

耶鲁公开课 - 欧洲文明课程节选

I'm so worried that I can't sleep a wink.

我非常担心，以至于一整夜难以入眠。

so that 课堂 - SpeakingMax英语口语达人

I have so much trouble sleeping at night.

到了晚上我就难以入眠。

Don't 实战 - SpeakingMax英语口语达人