In 1962, geologist Michel Siffre spent two months in a dark cave to study his sleep-wake cycle
Published: Aug 02, 2024
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in 1962 geologist Mitchell cifer spent 2 months in a dark cave to study his sleep wake cycle without external time cues he assumed each sleep was one day but miscalculated by 2 weeks his body naturally adjusted to Cycles longer than 24 hours sometimes reaching up to 50 hours