Beta waves are slowing.
3 seconds sound clip from the A Nightmare on Elm Street movie soundboard.
You can hear this line at 00:49:43 in the Blu-ray version of the movie.
Quote context
[...]
- What the hell are dreams anyway?
- Okay. She's going into deep sleep now.
- Heart rate is a little high. It's just due to anxiety. Otherwise she's nicely relaxed.
- All signs are normal. She could dream at any time now.
- She's into REMs now. She's definitely dreaming now. It's a good one too. Typical dream parameter.
- A nightmare now would be plus or minus five or six. She's about three.
- Doctor, what's she doing now? Is she asleep or awake?
[...]