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"One of the great tragedies of mankind is that morality has been hijacked by religion. So now people assume that religion and morality have a necessary connection."
- Arthur C. Clarke

Sleep Set (Sleep Headset)  
  An electronic device for inducing deep sleep.  

Louis Wu was determined to spend as much of his 200th birthday as possible awake with his friends. But what about sleep?

He'd started it at one minute past midnight that morning. Why not. His friends were in every time band. There was no reason to waste a single minute of this day. There were sleep sets all over the house for fast, deep cat naps. For those who hated to miss anything there were wakeup drugs, some with interesting side effects, others with none.
From Ringworld, by Larry Niven.
Published by Ballantine in 1970
Additional resources -

Here's another reference:

Louis woke slowly. He remembered donning a sleep headset and setting it for an hour of current. Presumably that had been an hour ago. After the set turned itself off the discomfort of having the thing on his head would have wakened him...

Compare to the hypnoteleset from the 1952 novel The Space Merchants.

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Additional resources:
  More Ideas and Technology from Ringworld
  More Ideas and Technology by Larry Niven
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