The sleeping bags can zip together.

这些睡袋是用拉链封严的。

《牛津词典》

I know he's going out with her, but I don't think they're sleeping together.

我知道他跟她在谈恋爱，不过我想他们还不至于上床吧。

《牛津词典》

But since they'd begun sleeping together, she had no joy in her life.

但自从他们开始睡在一起后，她的生活便没有了欢乐。

youdao

we had trouble sleeping together

我们一起睡觉很困难，

与室友和睦相处 - SpeakingMax英语口语达人

And, btw, no one at Social Security checks whether you are living together let alone sleeping together.

FORBES: 44 Social Security 'Secrets' All Baby Boomers and Millions of Current Recipients Need to Know - Revised!

But people are respectful of each other's space, he said, and they rarely spend time together in the dorm room aside from sleeping anyway.

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How can this be worse than sleeping on top of her parents' graves, saying Kaddish so many times the words ran together like nonsense, worse than sitting for days by the Pripiat River, watching for a little sock or Sophie's blue petticoat, sitting in the mud in only a nightgown and blanket, until the weather changed and Mariam came with the flier for America?

NPR: Excerpt: 'Away'