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To robustly investigate the effect of sleep patterns and screen time on cardiovascular risk factors, an integrative study design balancing methodological rigor, feasibility, and measurement accuracy is essential. Below is a detailed and refined proposal for sample size, sample design, and research design, incorporating findings from relevant research to ensure specificity and scientific grounding. --- Research Design A cross-sectional analytical observational study framework is appropriate for initial exploration of associations between sleep parameters, screen time, and cardiovascular risk factors in a broad population [1][2][3]. However, given the importance of temporality and causal inference, a consideration for a prospective cohort design (longitudinal) would enhance understanding of directionality and causation [1][4]. For cost and complexity reasons, the cross-sectional approach can be complemented later with prospective follow-up or nested longitudinal sub-studies. Justificatio