He couldn't get off to sleep.

他不能入睡.

《简明英汉词典》

Just try to get off to sleep for a while. Don't toss and turn restlessly.

凑合着睡一会儿, 别折腾了.

《现代汉英综合大词典》

I had a bad night; I went to bed early enough, but for some reason I couldn't get off to sleep.

我夜里睡得很不好, 上床相当早, 可是不知为什么睡不着.

《简明英汉词典》

Although I was absolutely exhausted from the long journey, I could not get off to sleep.

虽然长途旅行使我十分疲劳, 可我就是睡不着.

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There are several things you can try to help you get off to sleep.

有一些东西你可以尝试着用来帮助你入睡.

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