sleep

It is not widely known that most people, before the advent of the Industrial Revolution around 1800, tended to go to sleep shortly after nightfall but then get up around midnight for several hours before going back to sleep until dawn. Modern lab experiments have been able to reproduce this ancient, two-sleep pattern. Furthermore, there is separate anecdotal evidence that a number of people currently practice divided sleep as a natural habit, without the prompting of an experiment. Some of these people, in turn, use their nighttime wakefulness period for creative thought, writing and problem solving. The divided sleep phenomenon fits in very well with the dualistic and holistic principles of East Asian philosophy. One should ideally integrate work, thought and sleep with the natural light cycle in order to maximize the potential for individual creativity over the course of a full day and night.