Word: kleitman
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...determined by day and night-that is, a rhythm of about 24 hours. So ingrained is this habit that a daily temperature cycle occurs, body heat being lowest (among people who normally sleep at night) in the early morning, highest in the early afternoon. Some time ago Physiologist Nathaniel Kleitman of the University of Chicago determined to find out whether the human mechanism could break away from this ages-old habit, adapt itself to a cycle of different length...
...June 4, Dr. Kleitman and Graduate Student Bruce Richardson entered Kentucky's Mammoth Cave, took up residence in a snug cavern 119 feet underground where for them day and night on the surface had no meaning. There they lived a 28-hour cycle, sleeping nine hours each 28-hour "day." There were only six of their long days in a calendar week. They had a regular routine of eating, sleeping, reading, writing, walking...