An article I found, hope it helps.
A new idea arrives in this theorizing from the discovery that positive and negative ions in the atmosphere have an effect on behavior (negative ions usually favourable, positive the opposite). Positive ions are more abundant when the moon is full. However, the effect is slight compared to major sources of positive ions like air conditioning and air pollution.
The full moon affects many people worldwide causing emotional instability and insecurity. Since the gravitational force of the moon is strong enough to cause the tides, therefore it is possibly changing the gravitational effect on our glands and organs which can affect our moods.
Other effects include the different wavelengths of light coming from the moon, and the full moon's affect on our inner pathogens. The light from the moon is of a different combination of wavelengths and strength of light than what the sun gives us.
It is known that different colors of light cause different emotional reactions.
It could be that the moon's silvery colour is at least partially responsible for some people's reactions. Also, we have inner pathogens including yeast, worms, parasites, virus, and bacteria. Perhaps the day to night gravitational change causes a change in the activity of these pathogens, maybe increasing their activity which in turn increases their drain on our nutrients and increases the number of byproducts they excrete into our bloodstream.
Why the full moon affects some people more than others is another question. It may be because some people have borderline glandular functions or some have more pathogens. The most likely pathogen that contributes to the full moon effect is yeast. Too much yeast causes a reaction in people by causing them to feel 'stressed out' because of the loss of normal digestion and increased level of toxicity in the blood.
