Early Risers vs. Night Owls: Neuroscientific Insights into Happiness Levels

Do you envy those early risers who bounce out of bed at dawn? Or perhaps you’re one of the fortunate ones! It’s widely believed that the early bird catches the worm, with pop culture echoing the sentiment that early risers achieve more, get more done, and generally exude positivity.

Numerous articles suggest that waking up just an hour earlier can unlock hyper-productivity akin to the world’s most successful entrepreneurs.

If you identify as a night owl, relishing late nights and cozy mornings, you might be hoping that this notion isn’t entirely accurate. However, research into “chronotypes” largely supports the stereotype of energetic morning people versus laid-back night owls. Yet, the reality is often more complex.







Keep in mind that the majority of people (approximately 60%) are not strictly larks or owls. Most of us fall somewhere in between.

Your chronotype not only dictates when you hit the hay but also affects your peak performance times. Larks generally excel in the morning, while owls thrive later in the day, providing an edge in professions with evening shifts.

Interestingly, studies show that women are more likely to be larks while men often identify as owls.

Night owls are often more extroverted – Photo credit: Getty

Age also plays a crucial role; during adolescence, many shift towards an owl chronotype, but as we age, we tend to become more lark-like.

When it comes to happiness, research reveals a correlation between being a morning person and increased life satisfaction.

For instance, a study involving medical students at Dokuz Eylul University in Turkey showed that those who preferred early rising scored higher on happiness assessments. The results showed that 26.6% of night owls reported lower happiness levels compared to just 6.7% of larks.

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Similar trends appear with older adults, indicating that being a lark is more prevalent among them. Studies link being a morning person to higher happiness levels.

Additionally, research from the University of Leipzig indicates that larks enjoy greater life satisfaction and are less vulnerable to mental health issues.

In contrast, night owls seem to be more susceptible to conditions like depression, Seasonal Affective Disorder, and substance abuse challenges.

Around 60% of people fall between larks and owls – Photo credit: Getty

This disparity may be partly due to the challenges that night owls face, such as less sleep or more sleep disturbances, rather than an inherent advantage to being a lark.

Potential factors enhancing the lark’s advantage include superior emotional regulation and a more positive perception of time compared to owls.

These insights prompt us to consider the origins of our lark and owl tendencies, and crucially, whether they can be altered.

Research from the University of Warwick indicates that chronotype is linked to personality traits. Morning people often score higher in conscientiousness—one of the Big Five personality traits associated with discipline and ambition. Conversely, night owls typically exhibit extraversion and openness.

The promising news is that neither personality traits nor chronotype are fixed. Both are influenced by factors beyond genetics, including home environment and daily responsibilities.

As the Warwick study suggests, this plasticity implies that “…it may be possible to intentionally adjust one’s chronotype.”

To transition into a lark, consider basic strategies such as avoiding screens in the evening, gradually shifting your bedtime earlier, and rewarding yourself with enjoyable morning activities like a warm cup of coffee or a relaxing walk.

However, preliminary findings from the University of Warsaw indicate that seasonal shifts toward increased morningness did not correlate with improved mood or life satisfaction.

This suggests that merely changing your sleep schedule might not be a quick path to happiness. You may need to adopt a comprehensive approach rather than just setting a morning alarm.

The relationship between chronotype and happiness may also flow in reverse—if you lead a fulfilling life, finding it easier to retire early at night can make it simpler to awaken as a lark each morning.

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Source: www.sciencefocus.com

Neanderthals May Have Been Early Risers, New Study Finds

When the ancestors of modern Eurasians migrated from Africa and interbred with the archaic humans of Eurasia, namely Neanderthals and Denisovans, the DNA of the archaic ancestors became anatomically integrated into the genomes of modern humans. homo sapiens. This process could accelerate adaptation to Eurasian environmental factors, such as reduced UV radiation and increased seasonal variation. In a new study, scientists from Vanderbilt University, the University of Pennsylvania, and the University of California, San Francisco have discovered lineage-specific genetic differences in circadian genes and their regulatory elements between humans and Neanderthals. They found that the introgressed genetic variants were enriched with effects on circadian regulation and consistently increased morningness tendencies in Europeans. The results expand our understanding of how the genomes of humans and our closest relatives responded to environments with different light-dark cycles.

Velasquez Alsuley other. They found that genetic material from Neanderthal ancestors may contribute to the tendency of some people today to be early risers, the type of people who wake up early and go to bed more easily. Image credit: Holger Neumann / Neanderthal Museum.

All anatomically modern humans trace their origins to the African continent about 300,000 years ago, where environmental factors shaped many of their biological characteristics.

They arrived in Eurasia 70,000 years ago, but other humans, Neanderthals and Denisovans, lived there for more than 400,000 years.

These archaic humans diverged from anatomically modern humans about 700,000 years ago, and as a result, humans and archaic hominid ancestors evolved under different environmental conditions.

“Although there was considerable variation in the latitudinal range of each group, Eurasian hominids primarily lived at consistently high latitudes and were therefore exposed to larger amplitude seasonal fluctuations in photoperiod,” said the University of California. said the San Francisco school. Dr. John Capra and his colleagues.

“Given the influence of environmental cues on circadian biology, we hypothesized that these separate evolutionary histories produced differences in circadian traits adapted to different environments.”

Although previous studies have shown that many of the archaic ancestors of modern humans are not beneficial and have been removed by natural selection, some archaic hominin variants that remain in human populations has shown evidence of adaptation.

For example, archaic genetic variation is thought to be associated with differences in hemoglobin levels, immune resistance to new pathogens, levels of skin pigmentation, and fat composition among Tibetans at high altitudes.

Changes in patterns and levels of light exposure have biological and behavioral effects that lead to evolutionary adaptations.

Scientists have extensively studied the evolution of circadian adaptations in insects, plants, and fish, but humans have been less well studied.

The Eurasian environment where Neanderthals and Denisovans lived for hundreds of thousands of years is located at higher latitudes and has more variable daylight hours than where modern humans evolved before leaving Africa.

Dr. Capra and his co-authors therefore investigated whether there was genetic evidence for differences in circadian clocks between Neanderthals and modern humans.

Using a combination of literature searches and expert knowledge, they defined a set of 246 circadian genes.

They found hundreds of genetic variations unique to each strain that can affect genes involved in the circadian clock.

Using artificial intelligence techniques, they identified 28 circadian genes that contain mutations that could alter splicing in archaic humans and that may be differentially regulated between modern and archaic humans. identified 16 circadian genes.

This indicates that there may be functional differences between the circadian clocks of ancient and modern humans.

Eurasian modern humans and Neanderthal ancestors interbred, so some humans may have acquired circadian variation from Neanderthals.

To test this, researchers investigated whether introgressed genetic variants were associated with the body’s preferences for wakefulness and sleep in a large cohort of hundreds of thousands of people at UK Biobank. did.

They found a number of introgressed mutants that affected sleep preferences, and most surprisingly, they found that these mutants consistently increased morningness, or the tendency to rise early.

This suggests a directional influence on this trait and is consistent with adaptations to high latitudes observed in other animals.

Increased morning time in humans is associated with a shortened circadian clock period. This may be beneficial at high latitudes, as it has been shown that sleep and wakefulness can be coordinated more quickly with external timing cues.

Shortening of the circadian period is required to synchronize the long summer light period at high latitudes in Drosophila, and selection for a shorter circadian period results in a latitudinal shift with increasing latitude in natural Drosophila populations. There is a latitudinal gradient in which the period decreases.

Therefore, the bias toward morningness in introgressed mutants may indicate selection for shortened circadian periods in populations living at high latitudes.

The tendency to be a morning person may have been evolutionarily beneficial to our ancestors who lived in the high latitudes of Europe, and would have been a Neanderthal genetic trait worth preserving.

“By combining ancient DNA, extensive genetic studies in modern humans, and artificial intelligence, we discovered substantial genetic differences in the circadian systems of Neanderthals and modern humans,” Dr. Capra said. .

“And by analyzing fragments of Neanderthal DNA that remain in the genomes of modern humans, we discovered surprising trends, many of which influence the regulation of circadian genes in modern humans. These effects are primarily in the consistent direction of increasing Neanderthal tendencies.” Morning people. ”

“This change is consistent with the effects of living at high latitudes on animals’ circadian clocks, and changes in seasonal light patterns may allow them to adjust their circadian clocks more quickly. ”

“Our next steps include applying these analyzes to more diverse modern human populations and investigating the effects of the Neanderthal variants we identified on circadian clocks in model systems. and applying similar analyzes to other potentially adaptive traits.”

of the team paper It was published in the magazine Genome biology and evolution.

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Kayla Velasquez-Arsley other. 2023. Archaic genetic introgression shaped human circadian characteristics. Genome biology and evolution 15 (12): evad203; doi: 10.1093/gbe/evad203

Source: www.sci.news