to get out of bed and walk around while you are sleeping

I sleepwalked when I was a child. 我在小时候就有梦游的习惯。

Try not to wake him when he's sleepwalking. 尽量不要在他梦游的时候叫醒他。

to act without paying any attention to what you are doing, or without thinking carefully about what might happen

She sleepwalked her way into a scandal. 她不知不觉地陷入了一场丑闻里。

Until his cancer diagnosis, he had been sleepwalking through his life. 在诊断出癌症之前，他一直都浑浑噩噩地活着。