Blind Man Runs On Lunar Time

A psychologically normal blind man, living and working in normal society, was found to have circadian rhythms of body temperature, alertness, cortisol excretion, etc., that were out-of-step with society's normal 24-hour schedule. The periods of these biological cycles were about 24.84 hours and indistinguishable from the lunar day.

(Miles, L.E.M., et al; "Blind Man Living in Normal Society Has Circadian Rhythms of 24.9 Hours," Science, 198:42l, 1977.)

Comment. How are these lunar influences communicated, or are they innate?