The child is accustomed to sleeping alone.

这孩子习惯（Custom）独自睡了。

youdao

If there's nobody else in the bedroom, he's sleeping alone.

如果卧室里没有其他人，他就是孤独地睡去的。

youdao

If you look forward to sleeping alone and having your own space, that might indicate you're not ready to move in with him.

如果你希望一个人睡和能有私人的空间，那就说明了你还没准备好要搬去和他同住。

youdao

If there's nobody else in the bedroom,he's sleeping alone.

如果卧室里没有其他人，他就是孤独地睡去的。

耶鲁公开课 - 死亡课程节选

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!

She said Hathaway was downstairs alone at the time of the assault while his wife was upstairs sleeping.

BBC: Simon Hathaway jailed for killing his baby son Jordan

She said Mr Hathaway was downstairs alone at the time of the assault while his wife was upstairs sleeping.

BBC: Baby Jordan Hathaway died 'after father shook him'