How is it that our moon controls the sea tides? It is a strange suggestion to start off with let alone a fact.
As the moon is in orbit with the earth there is a gravitational pull between the two huge rocks that keeps them in sync. However it is said that the moon is gradually moving away from us. So to start with it must have had some fluctuation in the first place to come up with such theories. Which means that because of the fluctuations of the moon being drawn in there is a force and such a force that causes the water of the earth to move.
Someone has also suggested that:
The Moon has a long association with insanity and irrationality; the words lunacy and loony are derived from the Latin name for the Moon, Luna. Philosophers such as Aristotle and Pliny the Elderargued that the full Moon induced insanity in susceptible individuals, believing that the brain, which is mostly water, must be affected by the Moon and its power over the tides, but the Moon’s gravity is too slight to affect any single person. Even today, people insist that admissions to psychiatric hospitals, traffic accidents, homicides or suicides increase during a full Moon, although there is no scientific evidence to support such claims – wikipedia
This theory is probably where the werewolf stories come from.