SAIMSARA Journal

Machine Generated Science • ISSN 3054-3991

Morningness vs Eveningness: Systematic Review with ☸️SAIMSARA.

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Longevity

Issue 2, Volume 1, 2026

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• Last update: 2026-03-25 12:54:21
What is this paper about
This paper shows that chronotype is not a trivial lifestyle preference, but a biologically meaningful pattern linked across a huge evidence base to mood, sleep, metabolism, behavior, and real-world performance. The full paper is worth reading because it clarifies how strongly eveningness clusters with risk, where the signal is most consistent, and whether aligning life with one’s internal clock could become a practical lever for better health and longevity.

DOI: 10.62487/saimsarad5075212

Abstract: This paper aims to synthesize recent findings on the associations between morningness-eveningness chronotypes and a broad spectrum of health, behavioral, and physiological outcomes, as well as to identify key research gaps and implications for clinical practice. The review utilises 1136 original studies with 2634947 total participants (naïve ΣN). The extensive body of research reviewed highlights that morningness-eveningness (chronotype) is a fundamental biological trait with pervasive implications for human health and well-being. Across various adult and student populations, the reported prevalence of the evening chronotype varied widely, with a median of 15%. Eveningness is consistently associated with a higher risk of adverse outcomes, including increased depressive symptoms, anxiety, sleep disturbances, metabolic dysfunction, and poorer academic performance. For instance, adolescents with an eveningness chronotype preference had a higher probability of experiencing depression, anxiety, and stress symptoms compared to those with morningness or intermediate chronotypes. A significant limitation is the predominance of cross-sectional studies, which restricts causal inference. Future research should prioritize longitudinal intervention trials and the integration of multi-omics data to develop personalized chronotherapies, ultimately improving health outcomes by aligning daily routines with individual biological rhythms.

Keywords: Morningness-eveningness; Chronotype; Circadian rhythm; Mental health; Depression and anxiety; Psychometric properties; Adolescents; Sleep quality; Cardiovascular disease; Cognitive decline

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