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

How the Oral Microbiome Affects Weight Management, Liver Health, and Diabetes Risk

Scanning Electron Micrograph of Bacteria on Human Tongue

Credit: Science Photo Library/Alamy

Our dietary habits significantly impact our health, and the microorganisms residing in our mouths are equally crucial. A groundbreaking study investigating the relationship between the oral microbiome and metabolic health indicates that these findings could eventually help identify risks for obesity, prediabetes, and fatty liver disease.

“This represents one of the most ambitious efforts to correlate the oral microbiome with metabolic health across various organ systems,” noted Lindsay Edwards from King’s College London, who was not involved in the research.

The oral microbiome, the second largest microbial ecosystem in the body after the gut, has been linked to various health conditions. Previous research mainly focused on limited participants or single conditions, utilizing 16S ribosomal RNA profiling. While this method identifies broad microbial groups, it cannot specify bacterial strains or the genes they may carry.

In contrast, Imran Razak and his colleagues at the Mohammed bin Zayed University of Artificial Intelligence analyzed oral swabs from 9,431 participants using whole metagenomic sequencing, allowing for a comprehensive examination of all microbial DNA present. They paired this microbiome data with liver ultrasound scans, continuous blood glucose monitoring, and body composition analysis to create a robust statistical atlas. This atlas relates specific oral bacteria and their genes to 44 metabolic traits, such as liver fat, blood sugar fluctuations, and visceral fat, all relevant to conditions like high blood pressure, prediabetes, obesity, and fatty liver disease.

Many bacteria identified in this study have appeared in previous research. For instance, in early 2023, Ashish Jha from New York University Abu Dhabi reported that Streptococcus parasanguinis and Oribacterium sinus were more prevalent in obese individuals. Razak’s study corroborates these findings, linking these bacteria to increased BMI and body fat.

Additionally, new research has provided insights into microbial functions that may influence disease processes. For example, polyamine biosynthesis, associated with worse liver health and blood sugar control, as well as microbial pathways related to ceramide breakdown (lipids known to contribute to insulin resistance), were linked to adverse glycemic control.

Although the study does not definitively state that these bacteria cause health issues, Razak emphasizes that “bacteria serve as reliable indicators for future mechanistic studies.” The researchers hypothesize that the oral microbiome might not merely be a passive marker but may actively influence metabolic diseases.

Jha discusses potential pathways through which oral microbes might affect metabolic health, including the translocation of bacterial products into the bloodstream through inflamed gums, which can cause further inflammation. Oral microbes can also alter gut microbiota ecology and secrete chemicals that impact processes like blood sugar regulation and cardiovascular health.

Overall, the prevailing hypothesis suggests that it is not individual oral bacteria that lead to obesity or metabolic disorders, but rather “dysbiosis” of the oral microbiome, contributing to chronic inflammation and metabolic burdens through repeated microbial exposure, oral-gut transit, immune activation, and microbial metabolite production, as noted by Jha.

A puzzling aspect of this research is understanding why some individuals harbor potentially harmful microorganisms. Razak suggests that factors such as gum health, age, gender, smoking, and diet may all play a role. Notably, many associations persisted even when considering common oral health issues like periodontal disease.

Future studies that confirm these findings could enable the use of microbial signatures in the oral cavity as metrics for assessing metabolic risk. The prospect of a simple oral swab offering early warnings for conditions like fatty liver disease and blood sugar imbalances is particularly compelling, especially given the rising prevalence of metabolic disorders and the urgent need for non-invasive diagnostic tools, as highlighted by Edwards.

Adjusting the balance of these microorganisms may eventually become a viable therapeutic approach, Razak suggests.

While further research is needed to deepen our understanding of these associations and validate them across diverse populations, this study marks a significant advancement in microbiome research at a population level. It reinforces the growing recognition that the oral cavity is not only a reflection of oral health but may also act as a sentinel of systemic physiology, according to Edwards.

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Source: www.newscientist.com