en روانپزشکی- روان شناسی Psychiatry & Psychology پژوهشي Research <span style="font-family:Times New Roman;"><span style="font-size:12pt"><span style="unicode-bidi:embed"><span style="color:#333333"><strong>Background</strong> Nurses&rsquo; procrastination can negatively impact care quality and patient safety. Understanding this phenomenon helps identify underlying factors and inform preventive strategies that enhance occupational performance and health. This study aimed to investigate the relationship between occupational procrastination and sleep quality among nurses, considering the mediating role of emotion regulation.</span></span></span><br> <span style="font-size:12pt"><span style="unicode-bidi:embed"><span style="color:#333333"><strong>Methods</strong> This descriptive and cross-sectional correlational research employed structural equation modeling. The statistical population included nurses working in public hospitals in Shiraz. A total of 250 nurses (125 women and 125 men) were selected through convenience sampling based on predetermined inclusion criteria. Data collection tools included the Safarinia and Amirkhani-Razligui Organizational Procrastination Questionnaire, the Gross and John Emotion Regulation Questionnaire, and the Pittsburgh Sleep Quality Index. Data analysis was conducted using SPSS-26 and AMOS software within the framework of structural equation modeling.</span></span></span><br> <span style="font-size:12pt"><span style="unicode-bidi:embed"><span style="color:#333333"><strong>Results</strong> Modeling results confirmed a structural relationship between occupational procrastination and sleep quality mediated by emotion regulation. The fit indices indicated acceptable goodness of fit (&chi;&sup2;/df = 2.07, GFI = 0.91, AGFI = 0.92, NFI = 0.93, TLI = 0.92, CFI = 0.95, RMSEA = 0.06). Sleep quality showed a negative association with procrastination (&beta; = -0.54, p < 0.01), a negative association with adaptive emotion regulation (&beta; = -0.49, p < 0.01), and a positive association with maladaptive emotion regulation (&beta; = 0.47, p < 0.01). The indirect effect of adaptive emotion regulation on occupational procrastination was negative and significant (&beta; = -0.58, p < 0.01), while the indirect effect of maladaptive emotion regulation was positive and significant (&beta; = 0.43, p < 0.01).</span></span></span><br> <span style="font-size:12pt"><span style="unicode-bidi:embed"><span style="color:#333333"><strong>Conclusion</strong> The findings provide a framework for explaining occupational procrastination among nurses. It is recommended that mental health professionals incorporate training in positive emotion regulation and strategies to enhance sleep quality as practical interventions to reduce procrastination in clinical settings.</span></span></span></span><br> &nbsp; Emotion regulation, Nurses, Procrastination, Sleep quality 30 38 http://unmf.umsu.ac.ir/browse.php?a_code=A-10-4483-1&slc_lang=en&sid=1 Akram Malekzadeh akrammalekzadeh@pnu.ac.ir 100319475328460041543 100319475328460041543 Yes Department of Psychology, Payame Noor University, Tehran, Iran saeed Mazlomian s.mazlomian@pnu.ac.ir 100319475328460041544 100319475328460041544 No Department of Educational Science, Payame Noor University, Tehran