Interesting how there seems to an instinctive belief across cultures that the moon and its phases have a direct effect on human behavior. Stories werewolves come to mind... Hence, the English word - lunatic (for a crazy person), related of course to the Spanish & French words for the moon, luna & lune, and going back to Latin, I'm sure. Other expressions include "loony" and "crazy as a loon". The English adjective is "lunar", when speaking of the moon and things pertaining to it.