In 1972, French speleologist Michel Siffre locked himself underground for 180 days. No daylight. No clocks. No human contact. Just silence and darkness.
What happened? His body broke free of the 24-hour schedule we all live by—and shifted into a wild 48-hour cycle: 36 hours awake, 12 hours asleep.
Siffre’s cave experiment reshaped chronobiology—the science of biological time. It proved that our bodies run on hidden rhythms, not society’s man-made 9-to-5.
Which raises a chilling question: Is our modern lifestyle actually fighting our biology? Could this be why so many struggle with insomnia, burnout, and exhaustion?
