scholarly journals Moonstruck sleep: Synchronization of human sleep with the moon cycle under field conditions

2021 ◽  
Vol 7 (5) ◽  
pp. eabe0465 ◽  
Author(s):  
Leandro Casiraghi ◽  
Ignacio Spiousas ◽  
Gideon P. Dunster ◽  
Kaitlyn McGlothlen ◽  
Eduardo Fernández-Duque ◽  
...  

Before the availability of artificial light, moonlight was the only source of light sufficient to stimulate nighttime activity; still, evidence for the modulation of sleep timing by lunar phases is controversial. Here, we use wrist actimetry to show a clear synchronization of nocturnal sleep timing with the lunar cycle in participants living in environments that range from a rural setting with and without access to electricity in indigenous Toba/Qom communities in Argentina to a highly urbanized postindustrial setting in the United States. Our results show that sleep starts later and is shorter on the nights before the full moon when moonlight is available during the hours following dusk. Our data suggest that moonlight likely stimulated nocturnal activity and inhibited sleep in preindustrial communities and that access to artificial light may emulate the ancestral effect of early-night moonlight.

2020 ◽  
Author(s):  
Leandro Casiraghi ◽  
Ignacio Spiousas ◽  
Gideon Dunster ◽  
Kaitlyn McGlothlen ◽  
Eduardo Fernández-Duque ◽  
...  

As humans transitioned from hunter-gatherer to agricultural to highly urbanized post-industrial communities they progressively created environments that isolated sleep from its ancestral regulators, including the natural light-dark cycle. A prominent feature of this isolation is the availability of artificial light during the night, which delays the onset of sleep and shortens its duration. Before artificial light, moonlight was the only source of natural light sufficient to stimulate activity during the night; still, evidence for the modulation of sleep timing by lunar phases under natural conditions is controversial. Here we use data collected with wrist actimeters that measure daily sleep to show a clear synchronization of nocturnal sleep timing with the lunar cycle in participants who live in environments that range from a rural setting without access to electricity to a highly urbanized post-industrial one. The onset of sleep is delayed and sleep duration shortened as much as 1.5 hours on nights that precede the full moon night. Our data suggests that moonlight may have exerted selective pressure for nocturnal activity and sleep inhibition and that access to artificial evening light may emulate the ancestral effect of early-night moonlight.


2021 ◽  
pp. 074873042098363
Author(s):  
Alejandro A. Aguirre ◽  
Roberto A. Palomares ◽  
Aitor D. De Ondiz ◽  
Eleazar R. Soto ◽  
Mariana S. Perea ◽  
...  

Evidence has accumulated over the years indicating that the moon influences some aspects of the reproductive activity in animals and humans. However, little is known about the influence of the lunar cycle on the reproductive performance of cows under tropical conditions, where the environment strongly affects reproduction. This retrospective study was conducted with the aim of assessing the influence of the lunar cycle on some reproductive traits of tropical crossbred cows managed in a pasture-based system. Data from 5869 reproductive records from two commercial farms localized in the Maracaibo Lake Basin of Zulia State, Venezuela, were analyzed. Variables studied were first service conception rate, calving frequency, first postpartum estrous frequency, and pregnancy frequency. In addition to the lunar cycle, the effects of farm, season, and predominant breed were also considered. Data were analyzed using logistic regression and general linear model from SAS. First service conception was affected by lunar phases and predominant breed, but not by farm or season. For frequencies of calving, first postpartum estrus, and pregnancy, there was no main effect of farm, season, and predominant breed, whereas the effect of lunar phases was highly significant. First service conception was significantly greater in waning than in crescent phase of the lunar cycle. Frequencies of calving, first estrus, and pregnancy were highly correlated and showed greater figures around full moon and new moon. In conclusion, lunar cycle influenced first service conception, attaining greater values in the waning phase of the moon cycle. Frequencies of calving, first postpartum estrus, and pregnancy in crossbred cows showed a clear bimodal rhythm, whose greatest values coincided with new moon and full moon.


2012 ◽  
Vol 63 (4) ◽  
pp. 312 ◽  
Author(s):  
Jason Richard How ◽  
Simon de Lestang

Acoustic telemetry systems are an increasingly common way to examine the movement and behaviour of marine organisms. However, there has been little published on the methodological and analytical work associated with this technology. We tested transmitters of differing power outputs simultaneously in several trials, some lasting ~50 days, to examine the effects of power output and environmental factors (water movement, temperature, lunar cycle and time of day). There were considerable and volatile changes in detections throughout all trials. Increased water movement and temperature significantly reduced detection rates, whereas daytime and full-moon periods had significantly higher detection rates. All nine transmitters (from seven transmitter types tested) showed a sigmoidal trend between detection frequency and distance. Higher-powered transmitters had a prolonged detection distance with near-maximal detections, whereas lower-powered transmitters showed an almost immediate decline. Variation of detection frequency, transmitter type and the modelled relationship between distance and detection frequency were incorporated into a positioning trial which resulted in markedly improved position estimates over previous techniques.


Author(s):  
Ayesha Appa ◽  
Saki Takahashi ◽  
Isabel Rodriguez-Barraquer ◽  
Gabriel Chamie ◽  
Aenor Sawyer ◽  
...  

Abstract Background Limited systematic surveillance for SARS-CoV-2 in the early months of the United States epidemic curtailed accurate appraisal of transmission intensity. Our objective was to perform case detection of an entire rural community to quantify SARS-CoV-2 transmission using PCR and antibody testing. Methods We conducted a cross-sectional survey of SARS-CoV-2 infection in the rural town of Bolinas, California (population 1,620), four weeks following shelter-in-place orders. Participants were tested between April 20 th – 24 th, 2020. Prevalence by PCR and seroprevalence from two forms of antibody testing were performed in parallel (Abbott ARCHITECT IgG and in-house IgG ELISA). Results Of 1,891 participants, 1,312 were confirmed Bolinas residents (>80% community ascertainment). Zero participants were PCR positive. Assuming 80% sensitivity, it would have been unlikely to observe these results (p<0.05) if there were >3 active infections in the community. Based on antibody results, estimated prevalence of prior infection was 0.16% (95% CrI: 0.02%, 0.46%). The positive predictive value (PPV) of a positive result on both tests was 99.11% (95% CrI: 95.75%, 99.94%), compared to PPV 44.19%-63.32% (95% CrI range 3.25%-98.64%) if one test was utilized. Conclusions Four weeks following shelter-in-place, SARS-CoV-2 infection in a rural Northern California community was extremely rare. In this low prevalence setting, use of two antibody tests increased seroprevalence estimate precision. This was one of the first community-wide studies to successfully implement synchronous PCR and antibody testing, particularly in a rural setting. Widespread testing remains an underpinning of effective disease control in conjunction with consistent uptake of public health measures.


1996 ◽  
Vol 47 (1) ◽  
pp. 67 ◽  
Author(s):  
AJ Courtney ◽  
DJ Die ◽  
JG McGilvray

This study examined the lunar and die1 variation in catch rates and reproductive condition of adult eastern king prawns, Penaeus plebejus, in relatively deep (160 m) coastal waters off south- eastern Queensland. Females numerically dominated catches over most of the lunar cycle and constituted 76% of the weight of the catch. Analysis of variance (ANOVA) revealed an interaction between lunar phase and sex; catches peaked during Lunar Phase 3 (full moon � 3 days) and were particularly marked for males. This was the only period during the lunar cycle when the sex ratio approached 1 : 1. There was also an interaction between trawl-time and sex; male catch rates were at a minimum early in the evening, whereas female catch rates were at a maximum then and declined throughout the night. Trawler logbook catch rate data from the same area over a similar period indicated an interaction between lunar cycle and lunar phase. ANOVA revealed an effect of the interaction between phase and sex on the incidence of soft prawns; the incidence of soft males increased during Phase 4 (half moon waning to new moon � 3 days). Ovary weight also varied between phases and was higher during Phases 2 (half moon waxing to full moon � 3 days) and 4 (half moon waning to new moon � 3 days). Trends in the ovary weight and the incidence of histologically mature and ripe females suggested there are two periods of increased spawning activity during each lunar cycle. A cyclic regression fitted to the data explained 93% of the variation in the incidence of ripe females between samples. The influence of these cyclic trends in catch rate and reproductive condition should be considered when monitoring the spawning stock in the fishery and when planning sampling strategies in any future reproductive studies.


PEDIATRICS ◽  
1977 ◽  
Vol 59 (6) ◽  
pp. 846-846
Author(s):  
T. E. C.

Charles Dickens (1812-1870) was among the first of several English writers who visited the United States during the 1840s and 1850s. The description below of his visit to a free school in Cincinnati was included in his American Notes which Dickens wrote in 1842 upon completion of his six months' visit to our country. Cincinnati is honorably famous for its free schools, of which it has so many that no person's child among its population can, by possibility, want the means of education, which are extended, upon an average, to four thousand pupils annually. I was only present in one of these establishments during the hours of instruction. In the boy's department, which was full of little urchins (varying in their ages, I should say, from six years old to ten or twelve), the master offered to institute an extemporary examination of the pupils in algebra; a proposal which, as I was by no means confident of my ability to detect mistakes in that science, I declined with some alarm. In the girl's school, reading was proposed; and as I felt tolerably equal to that art, I expressed my willingness to hear a class. Books were distributed accordingly, and some half dozen girls relieved each other in reading paragraphs from English history. But it seemed to be a dry compilation, infinitely above their powers; and when they had blundered through three or four dreary passages concerning the treaty of Amiens, and other thrilling topics of the same nature (obviously without comprehending ten words), I expressed myself quite satisfied.


2022 ◽  
pp. 074873042110694
Author(s):  
Miguel F. Perea ◽  
Daniel A. Perdomo ◽  
Zenaida A. Corredor ◽  
Mario González ◽  
Hugo Hernandez-Fonseca ◽  
...  

A robust body of evidence has demonstrated that the lunar cycle plays an important role in the reproduction of fish living in natural environments. However, little is known about the influence of the moon on tilapia reproductive activity in intensive fish farming systems. This study aims to evaluate the influence of the lunar cycle on the reproductive performance of tilapias in an intensive outdoor tropical production system in Latin America. Records of two tilapia strains (Nile tilapia [ Oreochromis niloticus; n = 75] and Red tilapia [ Oreochromis spp.; n = 1335]) reared in concrete tanks in a commercial fish farm were analyzed. Over a 3-year period, 60,136 captures were made in intervals of 12 to 14 days and 6,600 females were manually spawned. The number of females spawned and the volume of eggs collected from each tank ( n = 9) were recorded. Data was analyzed by the general linear model and means were compared by least squares means method. A very slight or no variation was observed when the lunar cycle was split into two halves (crescent and waning). The proportions of females spawned and the volume of eggs per spawned female and per female in the tank varied considerably across the eight periods of the lunar cycle, with greater values in the waning than in the crescent phase. A significantly greater proportion of tilapia spawned and yielded more eggs around the full moon than around the new moon and remaining days of the lunar cycle. The moon cycle affected the reproductive activity of tilapia, which were more reproductively active around the full moon and most of the waning phase.


1944 ◽  
Vol 10 (2) ◽  
pp. 198-201
Author(s):  
Frank H. H. Roberts

Among the many student archaeologists serving in the armed forces of the United States, one of the first to make the supreme sacrifice was 1st Lieutenant Charles R. Scoggin. He was killed in action on Anzio beachhead, Italy, Feb. 2, 1944.Lieutenant Scoggin, son of Dr. W. J. and Essie (Cartwright) Scoggin, was born July 10, 1914, at Bridgeport, Nebraska. He received his preliminary schooling at Chula Vista, California, and in 1927 moved with his parents to Ovid, Colorado, where he attended high school, graduating in 1931. Because of the depression, he was unable to continue his formal education at that time and in 1933 moved with his family to nearby Julesburg, Colorado. He was employed at Julesburg until the autumn of 1935 when he enrolled in the University of Colorado at Boulder. As it was necessary for him to work his way through college his attendance was irregular and he had not completed the hours requisite to a-degree when the tide of world events swept him on to grimmer tasks in the summer of 1942.


The Auk ◽  
1986 ◽  
Vol 103 (1) ◽  
pp. 14-22 ◽  
Author(s):  
Yutaka Watanuki

Abstract Diurnal activity patterns of Leach's Storm-Petrels (Oceanodroma leucorhoa) and Slaty-backed Gulls (Larus schistisagus) were investigated. The petrels reduced activity in moonlight in May and June when the predation rate by gulls was relatively high. Petrel activity levels were inversely correlated with light intensities and the corresponding risk of predation by the gull. This suggests that nocturnal activity and moonlight avoidance by the petrel in its colony are an effective defense against diurnal predators. Activity synchronization of the petrel was most marked during the full moon, further supporting the predator-avoidance hypothesis.


Author(s):  
Zoë Druick

Since the 1990s, there has been a veritable explosion of documentary films and digital media productions accompanied by a correspondingly large number of books and articles dedicated to contextualizing and interpreting them. The documentary film form itself is not new, of course. It dates from the 1920s, cinema’s fourth decade, and has long been a realist form associated with state education and political communication. During the experimental phase of cinema’s development after 1895, numerous fictional and nonfictional styles met and intermingled. However, it wasn’t until John Grierson, a British film writer and producer, bestowed the name “documentary” on a certain sort of pedagogical nonfiction film in 1926 that the genre began to acquire epistemological stability and institutional support. Although related, documentary retains some autonomy from instructional films, industrial and sponsored films, TV news, home movies, newsreels, and YouTube videos. Documentary was from the outset a filmic counterdiscourse to Hollywood, as well as a way for nations outside of the United States to make a filmic mark. It was thought that film could show reality as it was, especially by showing the connections between invisible structural causes (such as colonialism, industrial capitalism, geopolitical conflicts) and their effects, an important corrective to the fantasies being propagated by Hollywood’s celebration of consumerism. For many decades after the 1920s, documentary maintained its association with serious topics (e.g., economic depression, the world wars, postwar traumas, the Cold War, and the struggle for civil rights) and oppositional politics (e.g., social movements, anticolonial struggles, peace movements, struggles for environmental justice) handled without the distraction of aesthetic concerns. A number of factors led to changes surrounding documentaries in the 1990s and beyond: including the increase in film production programs in colleges, the proliferation of cable television stations needing inexpensively produced content to fill the hours, new more affordable video and digital technologies, and the rise of media conglomerates restricting the content of cinema and television screens. For years filmmakers had caviled against the authoritative conventions of educational and anthropological documentary. Beginning as early as the 1960s, documentary became increasingly self-reflexive, finding numerous ways to draw attention to itself as a form of knowledge production. Despite perceived challenges to the original documentary project, documentary remains a mainstay of television and a vital connection between cinema and television studies. Critical postcolonial and feminist work has highlighted the modernist (even at times imperial) project traditionally associated with the documentary, while identifying the challenges launched from within this trajectory. At the edges of documentary studies can be found engagements with other popular reality-based forms such as reality television and mockumentary. Documentary texts, which became increasingly interactive and concerned with everyday life and politics, have become a growing presence on digital platforms. Although some moot the future of documentary, the dynamism of this subfield of cinema studies reflects the widespread flowering of documentary and reality-based forms in media culture.


Sign in / Sign up

Export Citation Format

Share Document