#circadianrhythms — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #circadianrhythms, aggregated by home.social.
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DATE: August 19, 2026 at 04:00PM
SOURCE: PSYPOST.ORG** Research quality varies widely from fantastic to small exploratory studies. Please check research methods when conclusions are very important to you. **
-------------------------------------------------TITLE: Morning sunlight exposure is linked to earlier sleep schedules
URL: https://www.psypost.org/morning-sunlight-exposure-is-linked-to-earlier-sleep-schedules/
Exposure to natural sunlight early in the day is associated with earlier sleep schedules and better overall rest. Researchers found that adults who spent more time in the morning sun had a more aligned internal biological clock, which can promote healthier sleep patterns. The study was published in the journal BMC Public Health.
The human body relies on an internal biological clock, known as the circadian rhythm, to manage sleep and wake cycles. This rhythm is governed by a tiny region in the brain called the suprachiasmatic nucleus. When light enters the eyes, signals travel to this brain region, which then guides the release of various chemical messengers.
One major messenger is melatonin, a hormone that promotes sleepiness. When darkness falls, the body produces more melatonin. When the eyes detect bright light, melatonin production drops, promoting wakefulness.
Modern lifestyles limit how much natural light people receive. Many adults work indoors or spend their leisure time looking at screens. During the COVID-19 pandemic, lockdowns and remote work dramatically reduced the amount of time people spent outside.
Extended periods spent indoors can disrupt the biological clock. When a person’s biological time falls out of sync with their daily obligations, such as waking up early for work despite not feeling rested, they can experience chronic exhaustion. This misalignment is sometimes called social jetlag.
Lead researcher Luiz Antônio Alves de Menezes-Júnior, a public health and nutrition researcher at the Federal University of Ouro Preto in Brazil, and his colleagues wanted to understand how sunlight at different times of the day affects specific elements of sleep. The researchers focused heavily on a metric called the midpoint of sleep, which is the exact halfway mark between the time a person falls asleep and the time they wake up. An earlier midpoint indicates a sleep cycle that is well-synchronized with the natural progression of day and night. A delayed midpoint can mean the internal clock is out of sync with typical social and work schedules.
The researchers conducted a cross-sectional survey of 1,762 adults living in the Iron Quadrilateral region of Brazil between October and December 2020. Interviewers visited homes in two mid-sized cities, using protective measures to prevent the spread of the coronavirus. They randomly selected households from census data, aiming to capture a representative sample across various socioeconomic groups. The participants answered detailed questions about their general health, socioeconomic status, and daily habits.
To evaluate sleep, the participants completed the Pittsburgh Sleep Quality Index, which is a validated questionnaire used to measure different dimensions of rest over the previous month. This tool helped the researchers calculate each person’s total sleep time, the amount of time it took them to fall asleep, and their sleep efficiency. Sleep efficiency is the percentage of time a person spends actually sleeping while in bed. The questionnaire also provided the data needed to calculate each participant’s midpoint of sleep and their overall sleep quality score.
Overall, the participants reported an average total sleep time of just over seven hours per night. The average sleep midpoint was around 5:18 a.m., meaning the typical participant fell asleep shortly before midnight and woke up just after 7:00 a.m.
To track light exposure, the researchers asked the participants to estimate how many days a week they spent time in the sun. The participants then estimated how many minutes they spent in the sun on those days across three specific time windows. These windows were before 10 a.m., between 10 a.m. and 3 p.m., and after 3 p.m.
The research team used statistical models to look for relationships between the timing of sunlight exposure and the various sleep metrics. To analyze the results, they used a directed acyclic graph, which is a theoretical model that maps out how different variables might influence one another. This helped them select the correct factors to adjust for in their models, avoiding false associations. They factored in variables such as age, gender, education level, chronic health conditions, and levels of physical activity.
The researchers found that morning sunlight exposure had the strongest relationship with the midpoint of sleep. For every additional 30 minutes a participant spent in the sun before 10 a.m., their sleep midpoint shifted earlier by an average of 23 minutes. The findings suggest that morning light serves as a primary signal to help reset the biological clock.
Afternoon sunlight exposure also showed a relationship with the sleep midpoint, though the effect was smaller. Every 30 minutes of sun exposure after 3 p.m. was associated with a 19-minute earlier sleep midpoint. The researchers noted that afternoon sunlight might signal the approaching evening, or it might coincide with outdoor physical activity that generally aids sleep.
Sunlight exposure in the middle of the day, between 10 a.m. and 3 p.m., had no statistically significant association with the midpoint of sleep. The lack of an association between midday light and sleep timing suggests that the biological clock is most responsive to light at the extremes of the day.
Beyond the sleep midpoint, morning sunlight was the only time window associated with a better overall sleep quality score on the questionnaire. People who spent more time outside before 10 a.m. reported generally better rest.
Conversely, sunlight exposure at any time of day showed no statistically significant association with total sleep time. Light exposure also had no statistically significant association with how quickly participants fell asleep or their sleep efficiency.
The study relies on observational data, meaning it can only identify patterns rather than prove that sunlight exposure directly causes sleep changes. The participants estimated their own sun exposure and sleep habits, which can introduce memory errors or biases compared to using objective tracking devices.
The researchers calculated a single average sleep midpoint for each participant for the entire week. They did not separate sleep data for workdays versus weekends. People often sleep in on their days off to catch up on rest. A broader weekly average might mask the specific effects of varying daily schedules and weekend sleep habits.
The analysis did not track exposure to artificial light or the amount of time participants spent looking at screens in the evening. Late-day screen light is known to influence sleep onset and biological rhythms, which could skew the interpreted effects of natural sunlight. Additionally, the sleep efficiency data was based entirely on self-reports. Measuring true sleep efficiency generally requires clinical tools like movement-tracking wristbands or formal sleep studies in a laboratory setting.
The data collection took place during the first year of the COVID-19 pandemic, a period marked by high social isolation, anxiety, and altered work routines. These unique societal conditions likely influenced the participants’ stress levels and sleep patterns in ways that are difficult to separate from their light exposure. Future research could use wearable technology to measure outdoor light exposure and sleep patterns precisely, helping clarify exactly how natural light guides the human biological clock under normal daily conditions.
The study, “The role of sunlight in sleep regulation: analysis of morning, evening and late exposure,” was authored by Luiz Antônio Alves de Menezes-Júnior, Thais da Silva Sabião, Júlia Cristina Cardoso Carraro, George Luiz Lins Machado-Coelho, and Adriana Lúcia Meireles.
URL: https://www.psypost.org/morning-sunlight-exposure-is-linked-to-earlier-sleep-schedules/
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#psychology #counseling #socialwork #psychotherapy @psychotherapist @psychotherapists @psychology @socialpsych @socialwork @psychiatry #mentalhealth #psychiatry #healthcare #depression #psychotherapist #MorningSunlight #CircadianRhythms #SleepHealth #EarlyWakeTime #SunlightAndSleep #BiologicalClock #SleepQuality #MorningExposure #NaturalLightBenefits #SleepMidpoint
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A #SpaceMirror Will Test Turning Night Into Day. What To Know About the Controversial Project
by Jeffrey Kluger, Jul 14, 2026
Excerpt: "The company envisions multiple uses for sun-reflecting satellites: assisting search and rescue operations, allowing construction projects to operate around the clock, charging solar power stations, increasing crop yield. But critics cite all manner of risks. Human and animal #CircadianRhythms could be badly affected if the sun—or a simulacrum of it—never sets. The practice of changing the clocks by a mere hour twice a year is already known to mess with human sleep-wake cycles, after all. Plants could bloom when they shouldn’t and die before their time. Orbital mirrors flashing and winking back to Earth could distract airline pilots. Finally, #LightPollution is already interfering with astronomical observations—a problem made even worse by satellite constellations like #SpaceX’s 10,000-strong #Starlink fleet. #ReflectOrbital’s 50,000 birds would dwarf even that."
Read more:
https://time.com/article/2026/07/14/reflect-orbital-space-mirror-what-to-know/Archived version:
https://archive.ph/P4uaz#NightSkies #ElonSucks
#SpacePollution #SunReflectingSatellites #BadIdeas #SpaceTechBros #SendTechBrosToMars #FCCFail #BrendanCarr #WTF -
Big Picture Science for June 29, 2026: Skeptic Check: Blue Light Special
Many of us know the feeling: we intend to go to bed but pull out our phones for one last scroll. Setting them aside hours later, we’re wide awake, unable to fall asleep. For years, scientists have singled out blue light emitted from our devices as the key culprit behind our post-scrolling insomnia, but the scientific consensus is shifting. Although blue light signals to brains that its daytime, surprising new research suggests that our glowing screens may play a smaller role than previously thought.
We present the fascinating science around biological mechanisms of sleep and wakefulness, why circadian rhythms have more in common with your grandfather’s clock than you might think, and why scientists who question the role of blue light in causing nighttime restlessness, still don’t let our phones off the hook completely.
Guests:
* Michael Gradisar – clinical psychologist and sleep researcher, former professor at Flinders University in Australia. Currently serves a head of Sleep Science at Sleep Cycle, a sleep tracking app company
* Jay Dunlap – geneticist and molecular geneticist at the Geisel School of Medicine at Dartmouth who works the molecular basis of circadian rhythms
* Mariana Figueiro – photobiologist, Director of the Light and Health Research Center and Professor of Population Health Science and Policy at the Icahn School of Medicine at Mount SinaiDownload podcast at - https://bigpicturescience.org/episodes/skeptic-check-blue-light-special
You can listen to this and other episodes at http://bigpicturescience.org/
Get early access to ad-free versions of every episode by joining us on Patreon. Thanks for your support!
#BlueLight #CircadianRhythms #Sleep #BigPictureScience #SETI #News #Podcast #Science
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#FCC Deciding Whether to Allow Startup to Launch Huge #MirrorSatellite to Blast Sunlight on Cities at Nighttime
"The implications for #wildlife, for all life, are enormous."
By Frank Landymore
Published Mar 10, 2026Excerpt: "The idea is as far-fetched as it is controversial. But something like it has been attempted before. In 1993, the Russian satellite Znamya, or 'Banner,' deployed a 65-foot-wide sheet of mylar that reflected a beam of light twice as bright as the Moon, illuminating a roughly three mile wide circle onto the Earth below like an orbital spotlight. It didn’t prove to be practical, however, with ground observers noticing no more than a flash of light, and it was exorbitantly expensive to pull off.
"Even so, it has the potential to massively disrupt the environment and interfere with many human operations. And the far-reaching consequences of such a technology is exposing the limits of the FCC’s remit.
"Experts fear that light from space mirrors could disrupt circadian rhythms in nature, posing a problem for flora and fauna alike. Animals might breed at the wrong time, and hibernating insects and migrating birds could be confused, Martha Hotz Vitaterna, a research professor of neurobiology at Northwestern University, told the NYT. And plants could bloom when pollinators aren’t active.
" 'The implications for wildlife, for all life, are enormous,' added Vitaterna, who is co-director of the Center for Sleep and Circadian Biology."
Read more:
https://futurism.com/space/fcc-huge-mirror-satellite#DarkSkies #LightPollution #BadIdea #USPol #Idiocracy #MirrorSatellites #CircadianRhythms
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🌅 Within you, billions of molecular clocks tick in coordinated patterns. From 90-minute sleep cycles to seasonal patterns in gene activity, your body orchestrates time across every scale.
Did you know your liver, heart, and skin each have their own circadian timing? ⚙️
✍️ Explore your inner clockwork: https://TPC8.short.gy/7G7SxGcA
⏰ You are not just living in time. You are made of it.
#Chronobiology #CircadianRhythms #BiologicalClocks #SleepScience #Neuroscience #SciComm #STEM #Biology #Brain #TPC8
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🫰 Time isn’t just personal. It’s expensive.
🔍 According to a recent review of over 360 scientific studies (link in comment), the time change doesn’t deliver - medically or economically.
Help us push for smart, science-based time policies in Europe.
✍️ Sign & share the petition: https://action.wemove.eu/sign/2024-10-are-you-sick-and-tired-of-changing-the-clock-twice-a-year-EN
#SleepHealth #BioClock #CircadianRhythms #clockchange #summertime #wintertime #timechange #DaylightSaving #DST #DitchDST #nomoreDST #stopDST #Standardtime #NaturalTime
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@consilium.europa.eu
Thank you for finally agreeing that the time changes need to stop - watch today's session at 15:00.
Then sign and share the European petition, 27 languages - link in bio.
https://multimedia.europarl.europa.eu/en/webstreaming/plenary-session_20251023-0900-PLENARY
#StopTimeChange #summertime #wintertime #timechange #DST #DaylightSaving #naturaltime #europe #zeitumstellung #normalzeit #zeitumstellungabschaffen #stopptdiezeitdiebe #CircadianRhythms #BioClock #SleepHealth #gesundheit -
This is a really beautiful mix of ambient jazz and techno with some experimental and leftfield sounds by Caro. Also this is the first time my music has been played on Noods Radio (Bristol, UK), so that’s exciting too! Caro played 'Lumina' and that's the first track on my latest album To the Nines.
📻 https://noodsradio.com/shows/circadian-rhythms-w-caro-2nd-october-25
:bandcamp: https://socool.bandcamp.com/album/to-the-nines#radio #Noods #NoodsRadio #CircadianRhythms #AmbientJazz #ElectronicMusic #ExperimentalMusic #LeftfieldTechno #Bristol
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The IANT welcomes the Spanish government’s proposal to eliminate Daylight Saving Time by 2026 and return to a more natural time zone, aligned with solar time. ☀️ naturaltimealliance.org/
#SleepHealth #BioClock #CircadianRhythms #clockchange #summertime #wintertime #timechange #DaylightSaving #DST #DitchDST #nomoreDST #stopDST #Standardtime #NaturalTime
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You’re not just being dramatic — your internal clock is in chaos. 😵💫
Want to know why?
🧠 The science might surprise you.
👉 Learn more + sign the petition: https://action.wemove.eu/sign/2024-10-are-you-sick-and-tired-of-changing-the-clock-twice-a-year-EN
#SleepHealth #BioClock #CircadianRhythms #clockchange #DitchDST #nomoreDST #stopDST #Standardtime #NaturalTime
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🌍 Why are we still changing the clocks?
Our bodies run on light — not legislation.
Twice a year, millions of people face disrupted sleep, reduced focus, and even increased health risks… all because of outdated time policies.It’s time for a change.
✍️ Sign the petition: https://action.wemove.eu/sign/2024-10-are-you-sick-and-tired-of-changing-the-clock-twice-a-year-EN
📣 Share this and tag someone who’s also sick and tired of it!
#SleepHealth #BioClock #CircadianRhythms #DitchDST #NaturalTime #clockchange #nomoreDST #stopDST #standardtime #naturaltime
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Switching to permanent #standardtime would prevent about 300,000 cases of #stroke per year and result in 2.6 million fewer people with #obesity by better aligning #circadianrhythms with natural light.
"We found that staying in standard time or staying in #daylightsavingtime is definitely better than switching twice a year," senior researcher #JamieZeitzer said.
An out-of-sync #circadian cycle has been linked with many different poor #health outcomes, researchers said.
https://www.usnews.com/news/health-news/articles/2025-09-16/permanent-standard-time-could-cut-strokes-obesity-among-americans -
How Tiny Molecular Machines Keep Our Cells Alive and Thriving
#CellBiology #AgingScience #Telomeres #OxidativeStress #Mitochondria #CircadianRhythms #StemCells #Genetics #CancerResearch #HealthAndWellness
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How Your Brain Forms Memories: The Role of Long-Term Potentiation
#Neuroscience #BrainPlasticity #Neuroplasticity #LongTermPotentiation #SynapticConnections #Glutamate #Neurotransmitters #CalciumSignaling #GlialCells #CircadianRhythms #BrainHealth #MemoryFormation #Learning #NeuroscienceEducation #BrainScience
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In our most recent episode Dr. Raffaele Teperino joined us for a deep dive into how paternal health before conception impacts offspring and maternal outcomes.
We explore epigenetics, circadian rhythms, seminal fluid signaling, and metabolic programming—challenging long-held views on intergenerational health.
Listen here: https://activemotif.com/podcasts-raffaele-teperino
#Epigenetics #PaternalHealth #SciencePodcast #CircadianRhythms #MetabolicHealth -
Dr. Raffaele Teperino joins us for a deep dive into how paternal health before conception impacts offspring and maternal outcomes.
We explore epigenetics, circadian rhythms, seminal fluid signaling, and metabolic programming—challenging long-held views on intergenerational health.
Listen here: https://activemotif.com/podcasts-raffaele-teperino
#Epigenetics #PaternalHealth #SciencePodcast #CircadianRhythms #MetabolicHealth -
Here is my first post on Mastadoom.
Had a fantastic time presenting my PhD research on neurogenetics at the UK Clock Club Meeting! It was a great opportunity to share my work on genetic influences on circadian rhythms and engage in insightful discussions with experts in the field.
Grateful for the valuable feedback and inspiring conversations—excited to take these ideas forward in my research!
@kofanchen#UKClockClub #Neurogenetics #CircadianRhythms #PhDResearch #Sleep”
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Exploring the Marvels of Our Brain: The Symphony of Sensory Modulation and Connectivity
#BrainScience #Neuroscience #CognitiveHealth #SensoryModulation #CircadianRhythms #Euthymia #FunctionalConnectivity #Neurophysiology #MentalWellness #BrainPower #Mindfulness #HealthyMind #LearnAboutTheBrain #NeuroNetworks #CelebrateYourBrain
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Unlocking the Secrets of Brain Science: Moods, Rhythms, and Neurochemistry
#BrainScience #Neuroscience #MoodManagement #Serotonin #CircadianRhythms #NeuroEndocrine #MentalHealth #NeuroImmune #GoodVibes #BrainHealth #Psychology #MoodTheory #ScienceExplained #WellnessJourney
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Woke up just before the top of the hour this morning, and instantly it started playing in my head…
Almost 7…
West Virginia…
Check me OUT of this John Denver timeline…
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Science has uncovered the role of light in mood changes and mental disorders https://www.psypost.org/science-has-uncovered-the-role-of-light-in-mood-changes-and-mental-disorders/?utm_source=dlvr.it&utm_medium=mastodon #MentalHealth #CircadianRhythms #MoodDisorders #LightTherapy #Depression
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“Year-round Standard Time has the potential to promote healthier circadian rhythms on a population level.” #CircadianRhythms #DitchDST
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Daylight Saving Time makes us set alarms an hour earlier than Standard Time. Permanent Standard Time aligns clocks to the sun, for naturally better sleep! #DitchDST #SleepHealth #CircadianRhythms
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⏰🔄 The magic happens in the proteins!
We found that 10% of proteins and a whopping 66% of phosphorylated proteins in O. tauri follow daily rhythms. It's a microscopic dance in time with the light. #ProteinDance #CircadianRhythms 2/7
➡️ https://doi.org/10.1093/jxb/erad290 -
@DesrochersLab Circadian rhythms are fascinating. They rule the lives of almost all organisms (bar those that live beyond the reach of sunlight).
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12-JUL-2024
Melanopsin DNA aptamers can regulate input signals of mammalian #CircadianRhythms by altering the phase of the molecular clock
#DNAaptamers Melapts to wake up refreshed in the morning.https://www.eurekalert.org/news-releases/1051176 #science #LightAndLife