Lunar effect

Biologists as well as artists and poets have thought about the Moon's influence on living creatures.
Despite all of the beliefs, no valid scientific study has ever found a significant extraordinary effect of the full Moon on life on Earth.

The term lunar effect refers to correlations between specific stages of the roughly 29.5-day lunar cycle and behavior in humans or other living things. In some cases these rhythms may depend on external cues, such as a greater or smaller amount of moonlight due to the moon's phases. In other cases, for example the approximately-monthly cycle of menstruation, the correlation in timing may reflect no known lunar influence. Some purported effects cannot simply be explained by variation in light levels.

A considerable number of studies have examined the effect on humans. By the late 1980s, there were at least 40 published studies on the purported lunar-lunacy connection,[1] and at least 20 published studies on the purported lunar-birthrate connection.[2] Several extensive literature reviews and meta-analyses found no correlation between the lunar cycle and human biology or behavior.[1][2][3][4]

A recent study of 33 volunteers that did not account for age and sex found a statistically significant connection between sleep quantity and quality and lunar phases, even though the subjects could not see the moon or its light.[5] But a subsequent analysis with better experimental controls, looking at considerably larger samples, did not find any correlations.[6]

The moon does influence the behavior of several animals, as described below.

Origins of the belief

Examples of the belief have been found in ancient Assyrian/Babylonian writing.[7] The term lunatic itself was derived in Latin from the word luna, meaning "moon".[8]


Claims of a lunar connection have appeared in the following contexts:


It is widely believed that the Moon has a relationship with fertility due to the corresponding human menstrual cycle, which averages 28 days.[7][9] However, no connection between lunar rhythms and menstrual onset has been conclusively shown to exist, and the similarity in length between the two cycles is most likely coincidental.[10][11]

Birth rate

Three studies carried out between 1959 and 1973 reported a 1 percent increase in births in New York following a full Moon. However, multiple studies have found no connection between birth rate and lunar phases. A 1957 analysis of 9,551 births in Danville, PA, found no correlation between birth rate and the phase of the Moon.[12] Records of 11,961 live births and 8,142 natural births (not induced by drugs or cesarean section) over a 4-year period (1974-1978) at the UCLA hospital did not correlate in any way with the cycle of lunar phases.[13] Analysis of 3,706 spontaneous births (excluding births resulting from induced labor) in 1994 showed no correlation with lunar phase.[14] The distribution of 167,956 spontaneous vaginal deliveries, at 37 to 40 weeks gestation, in Phoenix, AZ, between 1995 and 2000, showed no relationship with lunar phase.[15] Analysis of 564,039 births (1997 to 2001) in North Carolina showed no predictable influence of the lunar cycle on deliveries or complications.[16] Analysis of 6,725 deliveries (2000 to 2006) in Hannover revealed no significant correlation of birth rate to lunar phases.[17] A 2001 analysis of 70,000,000 birth records from the National Center for Health Statistics revealed no correlation between birth rate and lunar phase.[18] An extensive review of 21 studies from 7 different countries showed that the majority of studies reported no relationship to lunar phase, and that the positive studies were inconsistent with each other.[2] A review of 6 additional studies from 5 different countries similarly showed no evidence of relationship between birth rate and lunar phase.[19]

Blood loss

It is sometimes claimed that surgeons used to refuse to operate on the full Moon because of the increased risk of death of the patient through blood loss.[20] One team, in Barcelona, Spain, reported a weak correlation between lunar phase and hospital admissions due to gastrointestinal bleeding, but only when comparing full Moon days to all non-full Moon days lumped together.[20] This methodology has been criticized, and the statistical significance of the results disappears if one compares day 29 of the lunar cycle (full Moon) to days 9, 12, 13, or 27 of the lunar cycle, which all have an almost equal number of hospital admissions.[21] The Spanish team acknowledged that the wide variation in the number of admissions throughout the lunar cycle limited the interpretation of the results.[20]

In October 2009, British politician David Tredinnick asserted that during a full Moon "[s]urgeons will not operate because blood clotting is not effective and the police have to put more people on the street.".[22] A spokesman for the Royal College of Surgeons said they would "laugh their heads off" at the suggestion they could not operate at the full Moon.[23]

Human behavior

Mental Illness

Two studies found evidence that those with mental disorders i.e. Schizophrenia generally exhibit 1.8% of increased violent or aggressive episodes during the full Moon,[24][25] but a more recent study found no such correlation to that of nonschizophrenic human beings.[26] An analysis of mental-health data found a significant effect of Moon phases, but only on schizophrenic patients.[27] Such effects are not necessarily related directly to the appearance of the Moon.


A study into epilepsy found a significant negative correlation between the mean number of seizures and the phase of the Moon, but this correlation disappeared when the local clarity of the night sky was controlled for, suggesting that it was the brightness of the night that influenced the occurrence of epileptic seizures with advanced photosensitive epilepsy.[28]

Law and order

Senior police officers in Brighton, UK announced in June 2007 that they were planning to deploy more officers over the summer to counter trouble they believe is linked to the lunar cycle.[29] This followed research by the Sussex Police force that concluded there was a rise in violent crime when the Moon was full. A spokeswoman for the police force said "research carried out by us has shown a correlation between violent incidents and full moons". A police officer responsible for the research told the BBC that "From my experience of 19 years of being a police officer, undoubtedly on full moons we do seem to get people with sort of strange behavior - more fractious, argumentative."[30]

Police in Ohio and Kentucky have blamed temporary rises in crime on the full Moon.[31][32][33] In January 2008, New Zealand's Justice Minister Annette King suggested that a spate of stabbings in the country could have been caused by the lunar cycle.[34]

A reported correlation between Moon phase and the number of homicides in Dade County was found, through later analysis, not to be supported by the data and to have been the result of inappropriate and misleading statistical procedures.[3]


It was suggested, by Guy Cramer, president of the aerospace science company United Dynamics Corp, that the full Moon might have influenced voter behavior in the US 2000 Presidential Election.[35]

Stock Market

Several studies have argued that the stock market’s average returns are much higher during the half of the month closest to the new moon than the half closest to the full moon. The reasons for this have not been studied, but the authors suggest this may be due to lunar influences on mood.[36][37][38] Another study has found contradictory results and questioned these claims.[39]


A meta-analysis of thirty-seven studies that examined relationships between the Moon's four phases and human behavior revealed no significant correlation. The authors found that, of twenty-three studies that had claimed to show correlation, nearly half contained at least one statistical error.[1][3] Similarly, in a review of twenty studies examining correlations between Moon phase and suicides, most of the twenty studies found no correlation, and the ones that did report positive results were inconsistent with each other.[3] A 1978 review of the literature also found that lunar phases and human behavior are not related.[40]

Sleep quality

A July 2013 study carried out at the University of Basel in Switzerland suggests a correlation between the full Moon and human sleep quality.[5] Professor Cajochen and colleagues presented evidence that a lunar rhythm can modulate sleep structure in humans when measured under the highly controlled conditions of a circadian laboratory study protocol without time cues. Studying 33 volunteer subjects, the researchers found that subjective and objective measures of sleep varied according to lunar phase and thus may reflect human circalunar rhythmicity. Stringently controlled laboratory conditions, in a cross-sectional setting, were employed to exclude confounding effects such as increased light at night or the potential bias in perception. Measures of lunar influence on sleep structure, electroencephalographic activity during non-rapid eye movement sleep (NREM), and secretion of the hormones melatonin and cortisol, were retrospectively analyzed. At no point, during and after the study, were volunteers or investigators aware of the posteriori analysis relative to lunar phase. Around full Moon it was found that electroencephalogram (EEG) delta activity during NREM sleep, an indicator of deep sleep, decreased by 30%, time to fall asleep increased by five minutes, and EEG-assessed total sleep duration was reduced by 20 minutes. These changes were associated with a decrease in subjective sleep quality and diminished endogenous melatonin levels.[5] Cajochen said: "The lunar cycle seems to influence human sleep, even when one does not 'see' the Moon and is not aware of the actual Moon phase." [41]

There are suggestions that the 2013 Cajochen study is faulty because of a relatively small (n=33) sample size and inappropriate controls for age and sex.[6] A 2014 study with larger sample sizes (n1=366, n2=29, n3=870) and better experimental controls found no effect of the lunar phase on sleep quality metrics.[6] A 2015 study of 795 children found a 3 minute increase in sleep duration near the full moon,[42] but a 2016 study of 5,812 children found a 5 minute decrease in sleep duration near the full moon.[43] No other modification in activity behaviors were reported,[43] and the lead scientist concluded: "Our study provides compelling evidence that the moon does not seem to influence people's behavior."[44]

In animals

California Grunion fish have an unusual mating and spawning ritual during the spring and summer months. The egg laying takes place on four consecutive nights, beginning on the nights of the full and new Moons, when tides are highest.[45] However, this is a well understood reproductive strategy that is more related to tides than it is to lunar phase. It happens to correlate with the lunar phase because tides are highest when the Sun, Earth, and Moon are aligned, i.e., at new Moon or full Moon.

Correlation between hormonal changes in the testis and lunar periodicity was found in streamlined spinefoot (a type of fish), which spawns synchronously around the last Moon quarter.[46] In orange-spotted spinefoot, lunar phases affect the levels of melatonin in the blood.[46]

Evidence for lunar effect in reptiles, birds and mammals is scant,[46] but among reptiles marine iguanas (which live in the Galápagos Islands) time their trips to the sea in order to arrive at low tide.[47]

In insects, the lunar cycle may affect hormonal changes early in phylogenesis.[46] The body weight of honeybees peaks during new Moon.[46] The midge Clunio marinus has a biological clock synchronized with the moon.[5][48]

Spawning of coral Platygyra lamellina occurs at night during the summer on a date determined by the phase of the Moon; in the Red Sea, this is the three- to five-day period around the new Moon in July and the similar period in August.[49] Acropora coral time their simultaneous release of sperm and eggs to just one or two days a year, after sundown with a full moon.[50]

The Palolo worm that lives in the seas of Indonesia and Polynesia loose the terminal part of their bodies during a waning moon at a certain time of year. These parts float to the surface and release sperm and eggs. The terminal parts are gathered by people as a special food. The event would be predicted by the local priests, and the lunar calendar was set by the event.[51] Because the Palolo adjust their spawning time between October and November, and because of inter-island differences in spawning times, there are factors other than the Moon that control the timing. Such factor may include seawater temperatures, tides, weather, or other biological signals.[52]

In plants

The popular belief that the moon has an effect on plants is unsubstantiated. When witnessed, the effects have been indirectly attributed to "moon gardeners"' attentive care.[53]

Serious doubts have been raised[54] about the claim that a species of Ephedra synchronizes its pollination peak to the full moon in July.[55]

Proposed explanations


Believers in the lunar theory suggest several different mechanisms by which the behaviour of the Moon could influence the behaviour of human beings. A common suggestion is that, since the Moon affects large bodies of water such as the ocean (a phenomenon known as "tidal force"), the Moon should be expected to have an analogous effect on human beings, whose bodies contain a great deal of water.[7][56] However, this is a misconception that fails to take into account differences in scale. The tidal force is in fact very weak and should be expected to exercise no more gravitational pull on the human body than a mosquito.[7] Besides this, the "suggestion" failed to account for the dependence of tides from both the phase of the Moon and the time of day.

Believers (David Tredinnick being a prominent example) often support their claims by noting that many police officers, teachers, and nurses have observed a lunar effect in the course of their work. To the extent that nurses and police officers do indeed claim to observe patterns, this is most likely to be explained in terms of confirmation bias: People notice if something dramatic happens during a full Moon, but do not notice when nothing dramatic happens;[56][57] furthermore, dramatic occurrences that do not occur during full Moons are typically not counted as evidence against the belief.[7] Believers are further bolstered in their belief through communal reinforcement: The more people talk about the effect, the more people notice spurious relationships.[7]


Nocturnal carnivores are widely believed to have played an important role in human evolution, driving the need for nighttime shelter, the control of fire and our innate fear of darkness. We performed an extensive analysis of predatory behavior across the lunar cycle on the largest dataset of lion attacks ever assembled and found that African lions are as sensitive to moonlight when hunting humans as when hunting herbivores and that lions are most dangerous to humans when the Moon is faint or below the horizon.
C. Packer; A. Swanson; D. Ikanda & H. Kushnir (2011), "Fear of Darkness, the Full Moon and the Nocturnal Ecology of African Lions.", PLoS ONE, 6 (7): e22285, doi:10.1371/journal.pone.0022285 

For some 3–4 million years, bipedal hominins in the East African Rift valley were evolving in potential conflict and competition with fearsome carnivores including sabre-toothed cats equipped with excellent night-vision. Using the largest data set ever recorded – 1,000 lion attacks on humans across Tanzania between 1988 and 2009 – Craig Packer and his colleagues showed that there is a peak of attacks by lions upon humans during the evening dark hours following full Moon. According to Packer, this may help explain why so many myths and superstitions attribute fearsome dangers and nightmarish potencies to the Moon.[58] While not all archaeologists accept that lunar periodicity was ever relevant to human evolution, those favouring the idea include Curtis Marean, who heads excavations at the important Middle Stone Age site of Pinnacle Point, South Africa. Marean argues that anatomically modern humans around 165,000 years ago – when inland regions of the continent were dry, arid and uninhabitable – became restricted to small populations clustered around coastal refugia, reliant on marine resources including shellfish whose safe harvesting at spring low tides presupposed careful tracking of lunar phase. Against this background, if Marean is right, humans who ignored or misread the Moon might frequently have been drowned.[59]

With gradual offshore platforms during spring low tides, substantial areas of the intertidal zone are revealed, and these are the most productive and safest shellfish collecting times... Foragers should schedule visits to coastal residential sites at times during the lunar month when spring tides are present and then move slightly inland during neaps to broaden the size of the exploitable terrestrial area.
Marean, C. 2010. Pinnacle Point Cave 13B (Western Cape Province, South Africa) in context: The Cape Floral kingdom, shellfish, and modern human origins. Journal of Human Evolution 59: 425e-443 . 

Positive Ions

A further suggestion is that positive ions increase in abundance during a full Moon and that this should be expected to influence human behavior. However, this is a pseudo-scientific claim. Not only is the increase in frequency extremely slight (much smaller than that caused by air conditioning and air pollution),[56] but ionic chargepositive or negativehas no effect on human behavior, and no physiological effect other than static electric shock.[60]

Ions are charged particles in the air that are present by a few hundred to a few thousand per cubic centimeter. Some ions have either a positive or negative charge. Ion scientists have determined that an imbalance positive and negative ions can affect the human mind and body. Not everyone feels the effects the same way though. It has been determined that about 75% of the population is affected by positive ions in such a way that they experience hyperactivity, depression, violent behavior, asthma and migraines (policeops)The other 25% of the population feels no affect from positive ions. The amount of positive and negative ions a person breathes in changes from location to location and also changes with weather and the lunar cycle. Different times throughout the lunar cycle see an increase in the amount of positive ions in the atmosphere, which is what some scientists believe is the reason behind the "lunar effect". (policeops) The full moon creates an increase in positive ions, which in turn causes an increase in hyperactivity, depression, violent behavior, and can negatively effect physical health which is why there seems to be an increase in criminal activity and hospital visits. Since it does not effect everyone the same and the amount of positive ions varies from location to location, it would be hard to find any concrete or steady evidence to prove that the positive ions from the moon has an effect on human behavior.[61]

See also


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