- What's it like while you're in hibernation?
- Well, it's exactly like being asleep. You have absolutely no sense of time The only difference is that you don't dream.

11 seconds sound clip from the 2001: A Space Odyssey (1968) movie soundboard.

You can hear this line at 01:00:32 in the Blu-ray version of the movie.

Quote context

[...]

- Although hibernation has been used on previous space efforts, this is the first time men were put into hibernation before departure.

- Why was this done?

- This was done in order to achieve the maximum conservation of our life-support capabilities, basically food and air.

- Now, the three hibernating crew members represent the survey team.

- Their efforts won't be utilized until we approach Jupiter.

- What's it like while you're in hibernation?

- Well, it's exactly like being asleep. You have absolutely no sense of time The only difference is that you don't dream.

- As I understand it, you only breathe once a minute. Is this true?

- That's right, and the heart beats three times a minute.

- Body temperature is usually down to about three degrees centigrade.

- The sixth member of the Discovery crew was not concerned about the problems of hibernation for he was the latest result in machine intelligence.

[...]