sleepwalk          
verb [ I ] uk/ˈsliːpˌwɔːk/ us/ˈsliːpˌwɑːk/
 梦游
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。 
 See: sleepwalker
  未察觉;未在意
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。 
 - More examples
- One night he reportedly sleepwalked into sliding glass doors.
- Some studies suggest as many as a quarter of all children sleepwalk.
- Jenny still sleepwalks when she is ill.