FactSentinel

The belief that a full moon triggers spikes in crime, violence, or erratic behavior is one of the most persistent myths in popular culture, but decades of scientific research have failed to support it. Numerous large-scale studies analyzing police records, hospital admissions, psychiatric emergencies, and crime statistics have found no meaningful correlation between lunar phases and human behavior. A widely cited meta-analysis published in Psychological Bulletin reviewed dozens of studies on this topic and concluded that any observed links were statistically insignificant or the result of chance and flawed methodology.

The persistence of this myth is largely explained by a cognitive bias known as confirmation bias, sometimes called illusory correlation. When something unusual happens during a full moon, people tend to notice and remember it, reinforcing the belief. Ordinary nights with strange incidents, by contrast, are quickly forgotten because they don't fit the expected pattern. Additionally, the moon's high visibility and cultural mythology, from werewolf legends to the word "lunatic" itself, have given it an outsized reputation as a source of behavioral influence.

Some early studies did report weak associations, but subsequent research using larger sample sizes and more rigorous statistical controls consistently failed to replicate these findings. Law enforcement agencies and emergency rooms that have specifically tracked incident rates by lunar phase have found no discernible pattern. While the moon does affect tides through gravitational pull, its influence on the human body, which is mostly water, is negligible when compared to environmental factors like weather, alcohol consumption, or social stressors, which have far greater documented effects on behavior.