Note this quote from "Homeostasis" , Langley

Man exhibit many circadian rhythms.
He sleeps at about the same time each day;
his temp fluctuates a degree or two in a 
daily pattern; the eosinophil count in his blood
rises and falls; urine output and composition
also vary rhythmically as do other functions.

Under natural conditions the circadian period
is synchronized with the period of the earth's
rotation by means of various inputes from the
environment. 

The day-night changes in
illumination and temperature seem to be the most
important factors."

If not temperature moderation, then what
'just so' story explains all the above?

Energy moderation with modification through
descent.
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