A few people have mental disorders / behave eccentric on full-moon days. This, modern science, attributes to the effect of the moon’s power on the human mind. In fact, the word ‘lunatic’ comes from the word ‘lunar’ which relates to the moon.
The Vedas have described the connection between the Mind and the moon eons back. The Purusha Sukta underlines this by symbolically saying that the moon is the mind of the Cosmic Purusha. (’chandrama manaso jaatha:)
Interestingly, there is a sloka in the giant epic - Mahabharata that states that in this Kali Yuga, many will be afflicted with mental disorders!