Sleep quality in university students explained by sequential self-regulation model

Sleep is often treated as a matter of willpower — turn off the phone, keep a regular bedtime, stop drinking coffee at midnight. But a new study of university students suggests that good sleep is built on a much deeper psychological foundation, one that begins with what people know about health, passes through their capacity for self-regulation and their sense of control over their own bodies, and only then reaches the daily habits that ultimately determine how well they rest at night. The research, published in the journal Current Psychology, offers one of the most detailed models to date of how health literacy is translated, step by step, into sleep quality among emerging adults.

The study was led by Pham Thi Kieu Duyen and Nguyen Tien Hoang of the University of Danang – University of Science and Education in Vietnam, together with colleagues at Duy Tan University. Surveying 539 undergraduate students and analyzing the data with structural equation modeling, the team tested what they call a sequential mediation framework: a chain of psychological and behavioral mechanisms running from health literacy, through self-regulatory capacity and perceived control over health, to two distinct families of lifestyle behaviors, and finally to sleep quality. Every link in the proposed chain was statistically supported, and the pattern of effects held some surprises.

At the starting point of the model sits health literacy, which the authors deliberately reconceptualize. In much of the public health literature, health literacy is treated as a matter of information: whether people can read a prescription label, understand a doctor’s advice, or evaluate a health claim online. Drawing on the influential frameworks of Don Nutbeam and on newer umbrella reviews of health literacy dimensions, the researchers instead position health literacy as a capacity-level psychological resource — a reserve of cognitive and social competence that can be spent on regulating one’s own behavior. Their analysis distinguished two dimensions: social-critical health literacy, the ability to critically evaluate health information and navigate social and institutional contexts, and cognitive-navigational health literacy, the more cognitive capacity to understand and use health knowledge.

Both dimensions positively predicted self-regulatory capacity — the general ability to set goals, monitor one’s own behavior, resist impulses, and adjust course when habits drift. But the two were not equal players. The social-critical dimension exerted a significantly stronger effect on self-regulatory capacity than the cognitive-navigational dimension did. In other words, students who could critically appraise health messages, question misleading claims, and understand the social forces shaping their choices were also, on average, the students with the strongest self-regulatory machinery. Knowing facts about sleep, it seems, matters less than being able to think critically about health itself.

The next link in the chain connected self-regulatory capacity to perceived control over health — the belief that one’s own actions, rather than luck, fate, or external circumstances, determine one’s health outcomes. This construct echoes decades of research on health locus of control and perceived behavioral control, including meta-analytic work showing that perceived control shapes health behavior in predictable ways. In the new model, self-regulatory capacity strongly predicted perceived control, and perceived control in turn mediated the effects of self-regulation on lifestyle behaviors. Students who felt capable of steering their own behavior were also more likely to believe their health was in their own hands, and that belief translated into action.

Those actions were divided into two categories, and this distinction turned out to be the study’s most striking finding. Proactive lifestyle behaviors — things like starting an exercise program, actively seeking health information, or making deliberate changes to improve wellbeing — were positively associated with sleep quality. But maintenance-oriented lifestyle behaviors — the consistent, habitual, sustained practices that keep a healthy routine running day after day — showed a substantially stronger association with sleep. Behavioral consistency and habit formation, the authors conclude, matter more for sleep than bursts of enthusiastic self-improvement.

This asymmetry makes sense in light of what is known about sleep. Sleep quality is not governed by occasional virtuous acts but by the rhythmic regularity of daily life: consistent bed and wake times, stable eating patterns, regular physical activity, and the management of evening screen exposure and stimulants. Recent reviews of sleep hygiene have emphasized that the term is often used loosely, and empirical work assessing daily sleep hygiene behaviors has shown that the within-person regularity of these behaviors is what tracks sleep outcomes most closely. The new study adds an upstream explanation for why some students manage this regularity and others do not: the capacity for maintenance depends on a hierarchical chain of resources that begins with literacy and runs through self-regulation and perceived control.

Technically, the study employed covariance-based structural equation modeling, following established methodological standards for evaluating measurement quality and model fit. The authors assessed convergent and discriminant validity using criteria associated with Fornell and Larcker and with newer thresholds proposed by Henseler and colleagues, and they evaluated fit against widely used benchmarks from Hu and Bentler’s covariance structure analysis literature, while acknowledging the caution urged by later methodologists about rigid cutoff values. Sleep quality itself was conceptualized in line with the Pittsburgh Sleep Quality Index tradition, the standard instrument in psychiatric and behavioral sleep research since 1989. The choice of structural equation modeling over variance-based alternatives aligns with current methodological debate about when covariance-based approaches are preferable in social science research.

The theoretical significance of the work lies in what it rejects. Prevailing health behavior models — from the theory of planned behavior to temporal self-regulation theory — tend to explain sleep outcomes through proximal behaviors and immediate intentions, leaving undertheorized the question of how upstream psychological capacities become sustained regulatory patterns. By specifying a hierarchical capacity–cognition–behavior pathway, the study argues that health literacy should not be understood as a set of facts to be transmitted but as a psychological resource that is converted, via self-regulatory capacity and perceived control, into durable behavioral maintenance. Recent theoretical reviews of self-control and health behavior, including multi-behavior tests of the pathways linking self-control to outcomes, have pointed in a similar direction; the new research extends that logic specifically to sleep in emerging adulthood.

The practical implications reach university administrators, health educators, and campus wellbeing programs. Sleep disturbance is one of the most common health complaints among college students worldwide, and cross-sectional studies have repeatedly linked poor sleep in this population to stress, unhealthy eating, smartphone use, and irregular physical activity. If the new model is correct, interventions that merely deliver sleep information — a leaflet, a lecture, a social media campaign — are likely to underperform, because information sits at the weakest link in the chain. More promising would be programs that build critical health literacy and train self-regulatory skills, since these upstream capacities appear to generate the perceived control and behavioral consistency that sleep actually requires.

The authors are careful about the study’s limits. The data are cross-sectional, drawn from a single survey of undergraduates, so the sequential pathways, while theoretically motivated and statistically supported, cannot definitively establish causal direction; it is plausible, for example, that poor sleep erodes self-regulatory capacity in a feedback loop. The sample consisted of university students in Vietnam, and whether the capacity–cognition–behavior hierarchy generalizes to other populations, age groups, or cultural contexts remains an open question. The datasets generated in the study are available from the corresponding author on reasonable request, and the research was funded by the Funds for Science and Technology Development of the University of Danang under project number B2024-DN03-10, with ethical approval from the university’s Institutional Research Ethics Committee and informed consent obtained from all participants.

Even with those caveats, the study’s central message is likely to resonate far beyond academic psychology. In an era when sleep advice is abundant and sleep problems are endemic among young adults, the findings suggest that the pathway to better rest does not run through more information but through stronger capacities — the critical ability to evaluate health claims, the regulatory muscle to sustain routines, and the felt sense that one’s health is one’s own to shape. Habit, the study implies, is not the opposite of knowledge; it is what knowledge becomes when it passes through the machinery of self-regulation. For the millions of students lying awake at night, the most effective intervention may not be another tip about screens and caffeine, but a longer-term investment in the psychological resources that make consistent, maintenance-oriented living possible.

Pham Thi Kieu Duyen and Nguyen Tien Hoang contributed equally to the work, which was published in volume 45 of Current Psychology on 5 September 2026, with correspondence directed to the University of Danang – University of Science and Education and Duy Tan University.