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"SF looks towards an imaginary future, while fantasy, by and large, looks towards an imaginary past."
- Frederik Pohl

Sleep-Inducer  
  A device that electronically imposes sleep on a human being.  

Merton snapped the elastic bands of the cabin seat around his waist and legs, then placed the electrodes of the sleep-inducer on his forehead. He set the timer for three hours and relaxed.

Very gently, hypnotically, the electronic pulses throbbed in the frontal lobes of his brain. Colored spirals of light expanded beneath his closed eyelids, widening outward to sleep.


(Sleep-inducer from Boy's Life)

From Sunjammer, by Arthur C. Clarke.
Published by Boy's Life in 1964
Additional resources -

Compare to sleep surrogate from Robert Heinlein's 1941 novel Methuselah's Children, the sleep set from Larry Niven's 1970 novel Ringworld and the napcap From Niven and Barnes' 2000 novel Saturn's Race.

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Additional resources:
  More Ideas and Technology from Sunjammer
  More Ideas and Technology by Arthur C. Clarke
  Tech news articles related to Sunjammer
  Tech news articles related to works by Arthur C. Clarke

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