- What does that stuff do to you?
- For one thing, nightmares. You're wide-awake. But you're having nightmares.

10 seconds sound clip from the The Tingler (1959) movie soundboard.

You can hear this line at 00:38:19 in the Blu-ray version of the movie.

Quote context

[...]

- Time: 8:03. Sharp stinging sensation.

- Now he's sitting down.

- Is he all right?

- As far as I can tell.

- Definite blurring of vision now at 8:11.

- Emotionally, I feel nothing abnormal.

- What does that stuff do to you?

- For one thing, nightmares. You're wide-awake. But you're having nightmares.

- Blurring of vision has been replaced by distinct rocking and tilting sensation.

- I don't seem to be tilting, but the room is from side to side.

- Time 8:13.

- Emotionally, I begin to feel somewhat apprehensive. Probably normal, however.

[...]