Study Ties 5 Subtypes of Sleep With Distinct Health And Lifestyle Patterns : ScienceAlert

For years, people have categorized themselves as either “morning larks” or “night owls,” but emerging research suggests human sleep patterns are far more complex. A new study identifies five distinct subgroups of sleepers, and your chronotype – when you feel most alert – is linked to your health and lifestyle.

Beyond Morning and Night

Scientists have long suspected that the two-category system of chronotypes was an oversimplification. Researchers analysed data from 27,030 adults in the UK Biobank and more than 10,000 US teenagers, revealing a more nuanced picture of sleep habits. These “hidden subgroups” demonstrate that sleep isn’t simply about being an early riser or a late sleeper.

The Five Sleep Subtypes

The research identified two early-bird subtypes and three night-owl groups. One early-bird group generally experiences fewer health problems. However, another early-bird subtype is linked to depressive symptoms and antidepressant prescriptions. Night owls also exhibit significant diversity.

Subtype 1, a night owl, is associated with risky behaviors, emotional regulation difficulties, faster reaction times, and better cognitive performance compared to early birds. Subtype 2, another night owl, is linked to depression, smoking, and increased cardiovascular risk, along with lower physical activity and decreased white matter integrity in the brain. Individuals in this group are also more likely to use antidepressant drugs.

Subtype 3 represents a “morningness” pattern with fewer health issues. People in this group tend to avoid smoking and excessive alcohol consumption and engage in fewer risky behaviors, though they may experience higher anxiety. Subtype 4 is another early-bird chronotype, more common in women, and is linked to depressive symptoms and antidepressant use. Finally, Subtype 5 is a male-dominated night owl group associated with increased consumption of alcohol, cigarettes, and cannabis, as well as higher risks of cardiovascular problems and prostate diseases.

Implications and Future Directions

According to Le Zhou, a neuroscience grad student from McGill University in Canada, “In today’s digital and post-pandemic era, sleep patterns are more diverse than ever.” The researchers suggest that recognizing this biological diversity could inform more tailored interventions.

future research will further refine these chronotype classifications. It is also likely that healthcare professionals may begin to consider chronotype when developing personalized health recommendations. A possible next step could involve investigating how these sleep patterns interact with genetic predispositions and environmental factors.

Frequently Asked Questions

What are chronotypes?

Chronotypes are profiles that describe when during the day a person is most alert or sleepy. Early birds and night owls are the best-known examples.

How many sleep subtypes were identified in the study?

The study identified five distinct sleep subtypes: two early-bird subtypes and three night-owl groups.

Is there a link between sleep patterns and health?

Yes, the study found that each sleep subtype is associated with distinct patterns of human behavior and health, ranging from fewer health problems to increased risks of depression and cardiovascular disease.

Considering these findings, how might understanding your own sleep chronotype influence your daily routines and well-being?