Daytime Sleepiness, Insomnia Symptoms and Sleep Quality in Adults Entering a Structured Weight‐Loss Programme: The SCOOP ‐ RNPC Cohort

Background Daytime sleepiness, insomnia and poor sleep quality are common in adults with overweight/obesity. This study characterized these sleep‐related complaints and their associations with clinical characteristics at entry into the Nutritional and Psycho‐Behavioural Rehabilitation (RNPC) programme, identified clinical characteristics associated with impaired sleep health, and explored changes after weight loss. Methods This observational study was conducted within the prospective SCOOP‐RNPC cohort. Adults with overweight/obesity completed the Epworth Sleepiness Scale (ESS), Insomnia Severity Index (ISI) and Pittsburgh Sleep Quality Index (PSQI) questionnaires. An exploratory questionnaire‐based summary score (0–6) was used to describe combined sleep‐related profiles and compare baseline clinical characteristics. Longitudinal changes were explored in participants with assessments at baseline and programme end. Results Of 1886 participants with complete baseline sleep questionnaire data, 20.2% reported excessive daytime sleepiness (ESS score > 10), 23.4% had moderate‐to‐severe insomnia symptoms (ISI ≥ 15) and 63.3% reported poor sleep quality (PSQI > 5). For the exploratory summary score, 22.7%, 50.3% and 27.0% of participants had scores of 0–1, 2–4 and 5–6, respectively. In those with longitudinal data ( n = 310), changes in sleep‐related questionnaire scores were observed during follow‐up, and the proportion with a summary score of 5–6 increased from 31.0% to 45.5%. Conclusion Sleep‐related issues were common among adults entering structured weight‐loss care. Less favourable questionnaire‐based sleep profiles were associated with a greater burden of subjective symptoms. In exploratory longitudinal analyses, improvements in sleep‐related questionnaire outcomes were observed during the weight‐loss phase, although interpretation is limited by selective follow‐up and the absence of a control group.