General A.J. Pleasonton had conducted experiments which demonstrated a powerful beneficial effect from the violet ray of the light spectrum. Pleasonton’s experiments were conducted beginning in 1861 and continued at least into the 1870s. (Background: Power of the Violet Ray, Ersjdamoo’s Blog, November 26, 2014.)
A few decades before Pleasonton had conducted his experiments, Baron Dr. Carl (Karl) Ludwig von Reichenbach, a notable chemist, geologist, metallurgist, naturalist, industrialist and philosopher, and a member of the prestigious Prussian Academy of Sciences , also found a “wonderful vivifying force” in the violet spectral end of solar light. 
Beginning around 1860, Stephen Martin Saxby had investigated lunar influences on the weather. A tentative theory was that the moon never crosses the equator without there being a simultaneous disturbance of the barometer or thermometer, or both. (Background: Saxby’s Weather System, Ersjdamoo’s Blog, November 25, 2014.)
Beneficial effects from part of the solar light spectrum. An unexplained lunar effect on the weather. Strange forces seemed to be at work.
Dr. Von Reichenbach had been investigating cases of “sleepwalking”, also called somnambulism. This condition occurred in all sorts of people from various regions. What these people all had in common, Reichenbach discovered early on, was they were “sensitives” who evidenced special neurological states: heightened states where feeling was easily stimulated and prolonged. Such persons have been lumped into categories such as Franz Anton Mesmer’s “extremely susceptible persons”, and later Sigmund Freud’s “hysterics.” 
Reichenbach slowly came to the opinion that the root cause of somnambulism had to be some invasive, external force. He was reluctant however to confront what became increasingly obvious: that the common element of somnambulism had something to do with radiations from the Moon. But eventually Reichenbach yielded and began experiments. 
It began to appear there was some vital nutrient contained in the moonlight which aroused the sleepwalkers and made them journey outside. Some special energy, not in the light itself, was being conducted through it to the somnambulists. 
Among Von Reichenbachs findings were (1) the conducted energy was not itself light; (2) the energy was neither electrical nor magnetic; (3) the unknown energy could be absorbed and conducted along metal wires; and (4) matter could store the energy for long periods. 
If the sky was overcast at the time of the Full Moon, the somnambulists did not sleepwalk. Also blocking the force from the Moon was woolen cloth. 
Von Reichenbach called the strange energy the Od force. “Od force was not an inert force, it was a personal force; one whose influences permeated observers. As Od changed, so sensation changed.” 
The Od force permeated all matter. (Was it in fact the Ether, the super-subtle element believed in by the ancients? Or was it something else?) Sunlight produced the most powerful Od force manifestations, and was of mostly “negative” polarity. Moonlight, on the other hand, had a surplus of “positive” polarity. “The dangerous manner in which sleepwalkers often clambered up onto terraces, balconies, or even rooftops could now be understood. Sleepwalkers were mysteriously drawn outside in full moonlight in order to absorb Od-positive rays, to them a nutrient.” 
——- Sources ——-
 “Carl Reichenbach”, Wikipedia, November 26, 2014.
 Lost Science, by Gerry Vassilatos. Kempton, IL: Adventures Unlimited Press, 1999.