Lunatic - Lunar Hypothesis

Lunar Hypothesis

Philosophers such as Aristotle and Pliny the Elder argued 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.

In a 1999 Journal of Affective Disorders article, a hypothesis was suggested that the phase of the moon may in the past have had an effect on individuals with bipolar disorder by providing light during nights which would otherwise have been dark, and affecting susceptible individuals through the well-known route of sleep deprivation. With the introduction of electric light, this effect would have gone away, as light would be available every night, explaining the negative results of modern studies. The authors suggested ways in which this hypothesis might be tested.