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Quote by Carl Sagan

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The Dragons of Eden: Speculations on the Evolution of Human Intelligence

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Carl Sagan
Carl Sagan

Carl Sagan was an American astronomer, cosmologist, author, and science communicator, born on November 9, 1934, in Brooklyn, New York. He is renowned for his profound research into the cosmos and his dedication to popularizing science. Sagan proposed numerous theories about the origin of the universe and life, and he made complex scientific knowledge accessible to the public with his unique perspective and clear, engaging writing style. more

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“Maybe, I thought, Knight would talk about the marrow. He sat quietly, whether thinking or fuming or both, it was hard to tell. But he eventually arrived at a reply. It felt like some great mystic was about to revel the meaning of life. "Get enough sleep," he said. He set his jaw in a way that conveyed he wouldn't be saying any more. This was what he had learned. I accepted it as truth.”

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“Waking up in the same place in which you dozed off has never happened either to you or to anyone else. Ever. Earth does not stop moving when you sleep. Every hour that passes, Earth travels a little more than 800,000 kilometres around the centre of our galaxy. And so do you. That's the equivalent of about twenty trips around the planet. Every hour. No one minds, though, as long as their bed stays still beneath their body.”

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“You're kidding, right?" Shane asked. "You don't need caffeine. You need sleep." He held out the last cup, and Claire realized she'd been wrong; there was someone else in the shadows. Deeper in the shadows even than Oliver had been. Myrnin. He looked completely different to her now, and not just because he wasn't crazy anymore. He'd remembered how to dress himself, for one thing; gone were the costume coats and Mardi Gras beads and flip-flops. He had on a gray knit shirt, black pants, and a jacket that looked a bit out of period, but not as much as before. All clean. He even had shoes on. "Yes, you must sleep," he agreed, as he accepted the cup and tried the coffee. "I've gone to far too much trouble to train up another apprentice at this late date. We have work to do, Claire. Good, hard work. Some of it may even earn you accolades, once you leave Morganville." She smiled slowly. "You'll never let me leave." Myrnin's dark eyes fixed on hers. "Maybe I will," he said. "But you must give me at least a few more years, my friend. I have a great deal to learn from you, and I am a very slow learner.”

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“There are two gradations of cold that are always acceptable: Mild Frost, which is preferable for reading and writing and any other activity done indoors, and Absolute Zero, which is the only temperature suitable for sleep. There is nothing more delicious than being swathed in a cocoon of blankets and awaking with a nose frosted over with rime, and once I do achieve vampiric heights and fall asleep with the mastery of a corpse lately dead, I am best left alone until I wake up at my usual time. I do tend to bite when rattled out of my flocculent coffin, and everyone in my building knows never to disturb me during the early morning hours. Authors, being crepuscular creatures, should never be roused before 11am: the creative mind is never turned off; it only dies momentarily and its revived by the scent of coffee at the proper time. Bacon is also an acceptable restorative.”

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“What functions do dreams serve today? One view, published in a reputable scientific paper, holds that the function of dreams is to wake us up a little, every now and then, to see if anyone is about to eat us. But dreams occupy such a relatively small part of normal sleep that this explanation does not seem very compelling. Moreover, as we have seen, the evidence points just the other way: today it is the mammalian predators, not the mammalian prey, who characteristically have dream-filled sleep.”

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“Much more plausible is the computer-based explanation that dreams are a spillover from the unconscious processing of the day's experience, from the brain's decision on how much of the daily events temporarily stored in a kind of buffer to emplace in long-term memory... The American psychiatrist Ernest Hartmann of Tufts University has provided anecdotal but reasonably persuasive evidence that people who are engaged in intellectual activities during the day, especially unfamiliar intellectual activities, require more sleep at night, while, by and large, those engaged in mainly repetitive and intellectually unchallenging tasks are able to do with much less sleep.”

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“However, in part for reasons of organizational convenience, modern societies are structured as if all humans had the same sleep requirements; and in many parts of the world there is a satisfying sense of moral rectitude in rising early. The amount of sleep required for buffer dumping would then depend on how much we have both thought and experienced since the last sleep period.”

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