They say that the word lunacy come from the lunar - moon, it has been blamed as one that brings on those effects in a person.
It is like the broom being blamed as the cause of the collection of dirt in a room.
May be that is one reason why our fore fathers decided to get one to do exhaustive physical work on those days, so that the lunar effects could be channeled to a sweat and its mental effects not noticed, and still bring on an inner cleansing.
A walk around a hillock or a self proclaimed project, on those days.
Strange but good reasoning, better than being taken to a psychiatrist or for an exorcism through an exorcist, or more things, of subjugation
May we get to use the loony days of full moon, for the beneficial effects of liberating hidden resources within, by mystics who have worked on such channels.