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In 1972, Michel Siffre spent 205 days alone in a Texas cave with no sunlight or clocks, communicating only his biological data to researchers outside. His sense of time, wakefulness, sleep, and me...
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Link: https://old.reddit.com/r/interestingasfuck/comments/1vr3r7s/in_1972_michel_siffre_spent_205_days_alone_in_a/
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The original was posted on /r/interestingasfuck by /u/Distinct-Question-16 on 2026-08-17 20:24:18+00:00.

Original Title: In 1972, Michel Siffre spent 205 days alone in a Texas cave with no sunlight or clocks, communicating only his biological data to researchers outside. His sense of time, wakefulness, sleep, and memory became distorted. The experiment helped reveal how our internal biological clock works.
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