Since the morning after the dream.
5 seconds sound clip from the Dracula (1931) movie soundboard.
You can hear this line at 00:40:20 in the Blu-ray version of the movie.
Quote context
[...]
- How long have you had those little marks?
- Marks?
- Please.
- Mina, why didn't you let us know?
- Since the morning after the dream.
- What could have caused them, Professor?
- It's good to see you back again, Doctor. I heard you have just arrived.
- And you, Miss Mina. You're looking exceptionally...
- Pardon me, Dr. Seward, but I think Miss Mina should go to her room at once.
[...]