Show they lived und rl J A days Q to determine whether man could adjust himself to a life cycle differing from the 24 hour day observed almost since time began two university of chicago physiologists lived tor for 34 days in the depths of mammoth cave kentucky attempting a 28 hour cycle of living dr nathaniel kleitman director of the experiment was unable to break away from the 24 hour habit his periods of sleep and wakefulness remaining normal his assistant bruce richardson completely adapted himself to the six day week and enjoyed deep sleep for as long as five consecutive hours even during periods of normal daytime dr kleitman is shown checking the machine which registers the movements of the sleeping richardson |