| Sumario: | Objective The university period is a time characterized by significant lifestyle and psychological changes, during which smartphone use is widespread and often excessive. The aim of this study was to examine the relationship between smartphone addiction, sleep quality, and sleep hygiene. Materials and Methods This descriptive cross-sectional study was conducted with 408 students. Data were collected through face-to-face surveys, including a sociodemographic form, the Smartphone Addiction Scale (SAS)-Short Form, the Pittsburgh Sleep Quality Index, and the Sleep Hygiene Index (SHI). Results The mean age was 20.7 ± 1.9 years; 48.5% were male. According to SAS, 34.3% had smartphone addiction. Poor sleep quality was observed in 81.9% overall and 91.4% among those with addiction. SHI scores were significantly higher in addicted students. Conclusion Smartphone addiction is prevalent and negatively affects sleep quality and hygiene. Poor sleep hygiene is associated with low sleep quality. Promoting healthy screen use and sleep habits is essential to support student well-being.
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