I know. It's not an uncommon fear.

3 seconds sound clip from the Isle of the Dead (1945) movie soundboard.

You can hear this line at 00:30:17.316 in the Blu-ray version of the movie.

Quote context

[...]

- Good morning.

- Good morning.

- I wonder if I could have a word with you alone, Doctor? I have an explanation and apology to make to you.

- Certainly.

- Oh, don't go, I'm leaving. The ledge is getting too populous. Remember the General's instructions about gathering in groups.

- Doctor, I'm extremely sorry for what happened yesterday. I would like to explain.

- Of course.

- All my life, I've had a dreadful fear of premature burial. I awaken sometimes screaming with nightmares in which I see myself buried alive, waking to find myself entombed, without air stifling, and no escape.

- I know. It's not an uncommon fear.

- Perhaps I have more reason for my fear than most.

- You see, since childhood I've been ill. I have fainting spells. Trances.

- Was it I who mentioned catalepsy yesterday?

- Yes. I couldn't tell you then.

- I've had trances lasting more than a day with almost complete suspension of heartbeat and respiration.

[...]