Health & Wellness

Recent Study Highlights Health Risks Associated with Being a Night Owl



Recent research suggests that individuals who feel more alert in the evenings and prefer staying up late—often referred to as “night owls”—may be at an elevated risk for type 2 diabetes and several other unhealthy lifestyle habits. The study, spearheaded by Sina Kianersi from Brigham and Women’s Hospital and Harvard Medical School, indicates:

  • A 72% increased risk of developing diabetes over eight years in night owls compared to those who are early risers.
  • Despite controlling for lifestyle choices, night owls still showed a 19% heightened risk of diabetes.
  • Alongside irregular sleep patterns, night owls exhibited poor dietary habits, increased alcohol intake, higher Body Mass Index, and smoking habits.

Understanding Chronotypes

  • Chronotype refers to one’s sleep pattern determined by their internal body clock.
  • It influences daily energy peaks and alertness levels.
  • Disruption of these rhythms can affect metabolism, hormones, and temperature regulation, subsequently increasing the risk of chronic diseases.
  • Early birds tend to release melatonin earlier in the evening, whereas night owls secrete it later.

Nurses’ Health Study II

A collaborative study conducted by Harvard Medical School and Brigham and Women’s Hospital examined data from the Nurses’ Health Study II. This project aims to understand chronic disease causes in women by tracking their health outcomes.

  • Data from over 60,000 middle-aged women were analyzed from 2009 through 2017.
  • Within this period, about 2,000 diabetes cases were reported. Around 11% identified as night owls, 35% as early birds, with the rest having no distinct preference.
  • Night owls were found to be 19% more at risk for diabetes, even after adjusting for other factors.

Observational Research Caveats

  • The observational nature means the study only indicates a correlation and not causation.
  • The majority of participants were white women, limiting its applicability to broader populations.
  • Chronotypes are majorly influenced by genetics and are often challenging to alter permanently.
  • While these findings point towards a need for healthier lifestyle adjustments, societal norms and the mismatch of sleep preferences may also play a role. 

Annals of Internal Medicine recently published these findings, stating that even after accounting for factors like diet, BMI, and physical activity, night owls still showed an increased risk of diabetes.

Implications and Recommendations

  • Matching work schedules to one’s chronotype might mitigate the risk of developing type 2 diabetes.
  • Night owls working daytime shifts showed a higher risk, while those with later or overnight shifts did not.
  • Night owls are encouraged to:
  1. Moderate alcohol consumption
  2. Cease smoking
  3. Enhance physical activity
  4. Ensure adequate sleep

Previous Findings on Night Owls

Prior research has associated late sleep patterns with:

  • Elevated risks of obesity
  • High blood pressure
  • Cardiovascular ailments
  • Early mortality

The Broader Impact on Society

The recognition of the health implications associated with chronotypes should drive employers, educational institutions, and healthcare professionals to adjust and rethink traditional norms. The typical 9-to-5 workday, for instance, may not be ideal for everyone and can potentially negatively affect a significant segment of the population.

Workplace Adjustments

With the understanding of these new findings, employers might consider offering flexible working hours or promoting shift work tailored to individual chronotypes. Such changes could:

  • Boost employee productivity and morale.
  • Reduce health-related absenteeism.
  • Improve overall workplace well-being and job satisfaction.

Healthcare Implications

Medical professionals could also benefit from a deeper understanding of a patient’s chronotype. This information might assist in:

  • Tailoring medical advice and treatment plans.
  • Offering guidelines for optimal medication timing based on individual body clocks.
  • Providing counseling on lifestyle adjustments that can mitigate health risks.

Education and Awareness

A crucial step forward would be raising awareness about the significance of respecting individual body clocks. Schools and universities could:

  • Introduce staggered start times, offering students the opportunity to choose timings that align with their natural rhythms.
  • Incorporate sleep education into curriculums, ensuring students understand the importance of sleep and its impact on health and academic performance.


While the latest research further underscores the health risks associated with being a night owl, understanding one’s chronotype and making lifestyle adjustments can be crucial for health. Moreover, considering societal shifts to accommodate varying sleep preferences might also be a crucial step forward in promoting health and well-being.

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