"Lunatic!" That's a word for "crazy" and, yes, it comes from the Latin name for the Moon, "Luna." But does the full Moon actually drive people nuts?
Scientists have looked at the question for a while, and their results are inconclusive. They've examined whether certain human behaviors, such as the incidents of births, deaths, suicides, acts of violence or accidents have any correlation with the phases of the Moon. So far, the results have been mixed (not a great sign in science.)
Nevertheless, the majority of doctors, nurses and police still swear by the influence of the Moon. These are people not normally given to flights of fancy. So what's really going on by the light of the Moon?
There is some evidence that people sleep less (or not as well) when the Moon is full. There are also studies that suggest the certain types of seizures may be more likely. One hypothesis is that the increased light of the full Moon may affect brain chemistry. Of course, modern technology may be mitigating this effect, which may have been more pronounced before the invention of electric lights. (Of course, no one seems to ask whether using electric lights at night cause imbalances of their own.)
Astrologers might argue that the Moon's influence is not confined to gravity or visible light. Rather, Luna's effect is more direct on the psyche, the subtle energies of the body and soul. To say that the "veil" is thinner during new or full Moons, or that people report more psychic experiences or vivid dreams, may be a bit more difficult to study.
Like the Moon herself, the answer remains mysterious. Perhaps you have your own answer -- if you're not too busy howling at the sight of the full Moon.