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"We follow the scientists around and look over their shoulders."
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![]() People have long used expressions like "I'll sleep on it" or "I'll consult the pillow" to express the notion that some sort of learning occurs during sleep.
The idea of using some sort of technology to play back useful materials to make better use of sleep dates to the late nineteenth century, when the phonograph was developed.
Although there have been a few formal studies done in the 1950's and 1960's, sleep-learning has never really taken off.
The earliest mention in sf (as far as I know) on the subject of sleep teaching is way back in Hugo Gernsback's 1911 classic Ralph 124c 41 + - see the entry for hypnobioscope and the toposcope from Cities in Flight (1955) by James Blish..
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