Alexander Popov. The secrets of the origin of mankind (№ 176333)

There is a curious physiological experience, held several times by scientists from different countries to find out how fast are the internal biological clock of a person. Man is placed in a closed space where nothing can tell him any time. First experimental live according to the usual 24-hour cycle, the sleep and wakefulness begin to shift and come into total chaos, then many people stabiliziruemost the sleep and energy mode 36-hour day.