TIL about French geologist Michel Siffre

still about French geologist Michelle cifra who in a 1962 experiment spent 2 months in a cave without any references to the passing time he eventually settled on a 25-hour day and thought it was a month earlier than the date he finally emerged from the cave a Spanish woman recently recreated this experiment and spent 500 Days in a cave sometimes I would sleep 2 hours or 18 hours and I couldn't tell the difference that is an experience I think we all can appreciate it's the problem of psychological time it's the problem of humans what is time we don't sounds like an illusion literally me 18 but with a bedroom instead of cave