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While Edison is known to have frequently slept only four hours a night, it is reported that he also took frequent daytime naps. His total sleep time seems to have been close to 8 hours each 24 hours. Given Edison's personal philosophy it follows that he invented the electric light bulb. No single invention has so disrupted the human sleep cycle as electric lights.
https://healthreviewfactory.com/the-stop-snoring-and-sleep-apnea-exercise-program-review/
in Earthquake Engineering by  

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