Abstract
Humans follow the diurnal rhythm of the sun to form an internal rhythm of 24-hour cycles. On the other hand, when such restrictions are removed, an internal rhythm of 25-hour cycles reminiscent of the lunar cycle emerges. In addition, women’s menstrual cycles are also seen to be in sync with the monthly rhythms. In order to elucidate the truth behind these events, I created a new theoretical system (gradation theory) by combining the two facts of the orbital motion of the moon and the cosmic ray arrival. By applying it, I found that the human body rhythm is formed in dependence on external factors. In addition, a logical answer was derived from it about the nature of sleep. In the future, sleep will take an increasingly prominent place in human endeavors.
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