I'm gonna wake them up.
3 seconds sound clip from the Step Brothers (2008) movie soundboard.
You can hear this line at 01:06:26 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, it... You know, they'll go back to bed.
- No. No.
- See, back to bed. They'll be fine.
- No. Why would you do such a thing?
- Never, ever wake up a sleepwalker.
- See, that's it. We can't ever do anything.
[...]