The research, published in the journal Current Psychology, was conducted by Halise Taşkın Duman, Füsun Uzgör, and Pınar Çiçekoğlu Öztürk of Muğla Sıtkı Koçman University. The team set out to answer a deceptively simple question: what predicts happiness in people undergoing maintenance hemodialysis? Their answer, drawn from 186 patients, is strikingly concrete. Three variables—sleep quality, mental well-being, and psychological resilience—together explained 64.8 percent of the variance in happiness scores, a remarkably large share for research on subjective well-being in any population, let alone one facing the physiological disruptions of kidney failure.

The study used a descriptive and correlational design, relying on four well-validated instruments. Happiness was measured with the Oxford Happiness Questionnaire, sleep quality with the Pittsburgh Sleep Quality Index, mental well-being with the Warwick-Edinburgh Mental Well-Being Scale, and resilience with the Brief Resilience Scale. Each of these tools captures a different dimension of the patient’s inner and outer life: the emotional tone of daily experience, the architecture of the night, the sense of psychological flourishing, and the capacity to bounce back from adversity. By combining them, the researchers built a statistical portrait of what it feels like, and what it takes, to be happy while living on dialysis.

The headline finding concerns sleep. Overall happiness, mental well-being, and resilience in the sample were generally moderate, but sleep quality was poor—and poor sleep was significantly linked to inadequate social support and to the disruption of the sleep-wake cycle caused by dialysis sessions themselves. This is not a trivial side effect. Hemodialysis typically requires patients to attend clinics three times a week, often in the early morning, upending natural circadian rhythms. Add to that the physical discomfort of treatment, symptoms such as itching, and the metabolic disturbances of end-stage kidney disease, and the result is a population in which insomnia and fragmented sleep are common. Previous systematic reviews and meta-analyses have documented high rates of insomnia and poor sleep in chronic kidney disease, and the new study now ties that disturbed sleep directly to the emotional lives of patients.

Statistically, the relationships were clear and consistent. Happiness correlated negatively with sleep quality scores on the Pittsburgh index—meaning that worse sleep, which produces higher scores on this instrument, went hand in hand with lower happiness (r = -0.318, p < 0.01). Happiness correlated positively and strongly with mental well-being (r = 0.764, p < 0.01) and with psychological resilience (r = 0.556, p < 0.01). In the regression model, the three predictors jointly accounted for nearly two-thirds of the differences in happiness between patients (F = 111.746, p < 0.001). The strength of the well-being association in particular suggests that how patients appraise their psychological state matters enormously, but the sleep finding is the one with the most obvious practical implications, because sleep is something clinicians can assess and, in principle, treat.

The study also found that happiness, well-being, and resilience varied significantly with social circumstances. Education level, social support, full-time employment status, changes in family relationships after starting dialysis, and the impact of dialysis sessions on the sleep-wake cycle all shaped psychological outcomes. Patients with more education, jobs, and supportive families fared better. This aligns with a broader body of evidence: meta-analytic work has shown that social support is associated with better sleep, and longitudinal research in hemodialysis populations has linked social and family support to greater psychological resilience. Happiness, in other words, is not manufactured inside the skull alone. It is scaffolded by relationships, routines, and the practical stability that work and education provide.

Why should sleep matter so much for happiness in this population? The authors point to the physiological disruption that dialysis imposes on the sleep-wake cycle, but the mechanisms likely run in both directions. A large meta-analysis of randomized controlled trials has shown that improving sleep quality leads to measurable improvements in mental health, suggesting sleep is not merely a symptom of distress but a causal contributor to it. Poor sleep amplifies pain perception, impairs emotional regulation, and erodes the energy needed to maintain social ties—the very ties that the study found to be protective. For a dialysis patient, a bad night can cascade into a worse day, a skipped social engagement, and a deepening sense of isolation, while better sleep could interrupt that spiral.

Resilience, the capacity to recover from stress, emerged as the second-strongest correlate of happiness. This fits with a growing literature on chronic illness. Studies in patients with diabetes, multiple sclerosis, and rheumatic disease have found that resilience predicts social and professional functioning, and research in Japanese hemodialysis patients has shown that resilience mediates the relationship between family functioning and mental well-being. The Turkish findings extend this picture by showing that resilience operates alongside, not instead of, physiological factors. A patient who sleeps poorly and feels isolated will struggle to be happy no matter how naturally resilient they are; conversely, resilience cannot compensate for a circadian rhythm shattered by three weekly dialysis sessions. The biopsychosocial framework that has gained traction in nephrology—treating kidney disease as a condition of body, mind, and social world simultaneously—appears well supported by these numbers.

The practical message for clinicians is that holistic care is not a slogan but a statistical necessity. If nearly two-thirds of the variation in happiness can be traced to sleep, well-being, and resilience, then nursing interventions that target only the physical aspects of dialysis leave most of the psychological picture untouched. The authors argue for care that combines sleep management with psychosocial support: screening for sleep disorders, adjusting dialysis schedules where possible, involving families, and building programs that strengthen coping skills. Prior interventional studies lend plausibility to this approach. Happiness training programs have reduced depression and anxiety and improved quality of life in hemodialysis patients, and hope-based group therapy has improved general health and happiness. Nonpharmacological sleep interventions are likewise being evaluated for this population.

There are, of course, limits to what a single cross-sectional study of 186 patients in one country can establish. Correlation does not prove causation, and it remains possible that unhappy patients sleep worse rather than the reverse, or that some unmeasured factor—disease severity, comorbid depression, time on dialysis—drives both. The authors also note that the data, containing sensitive clinical and psychosocial information from a vulnerable population, are available only on reasonable request rather than openly. Still, the size of the explained variance is hard to dismiss, and the convergence of these findings with international evidence on sleep, social support, and resilience in kidney disease gives the results considerable weight.

What makes the study resonate beyond nephrology is its implicit theory of happiness under adversity. Happiness, the data suggest, is not the absence of illness but the presence of conditions: restorative sleep, a sense of psychological flourishing, the capacity to recover from setbacks, and a web of people who care. For the 186 patients in this study, and for the millions like them, those conditions are not luxuries. They are, in a very real sense, part of the treatment.

Subject of Research: Predictors of happiness among hemodialysis patients, focusing on sleep quality, mental well-being, and psychological resilience

Article Title: Predictors of happiness in hemodialysis patients: the roles of sleep, mental well-being, and resilience

Article References: Duman, H. T., Uzgör, F., & Öztürk, P. Ç. (2026). Predictors of happiness in hemodialysis patients: the roles of sleep, mental well-being, and resilience. Current Psychology, 45(19), Article 1580. https://doi.org/10.1007/s12144-026-10139-z

Image Credits: AI Generated

DOI: 10.1007/s12144-026-10139-z

Keywords: hemodialysis, happiness, sleep quality, mental well-being, psychological resilience, chronic kidney disease, social support, insomnia, health psychology, quality of life, nursing interventions, Türkiye