<![CDATA[Poor smartphone Use habits before bedtime and poor sleep quality remain common among adolescents. This study aimed to analyze the relationship between smartphone use habits before bedtime and sleep quality among adolescents at SMK Muhammadiyah 2 Banjarmasin. This study employed a quantitative method with a correlational design using a cross-sectional approach. The population consisted of 394 adolescents, and a sample of 199 respondents was selected using proportional stratified random sampling. The instruments used were the Smartphone Use Habits Before Bedtime Questionnaire, developed based on Hambali (2021), and the Pittsburgh Sleep Quality Index (PSQI). Data were analyzed using the Chi-Square test. The results showed that most respondents had poor smartphone use habits before bedtime (93 respondents; 46.7%) and poor sleep quality (128 respondents; 64.3%). The Chi-Square test revealed a significant relationship between smartphone use habits before bedtime and sleep quality among adolescents at SMK Muhammadiyah 2 Banjarmasin (p = 0.027), with a weak association (Cramer's V = 0.190). The study concluded that smartphone use habits before bedtime were significantly associated with sleep quality among adolescents. Adolescents are recommended to use smartphones wisely, particularly by limiting smartphone use before bedtime, to help improve sleep quality.]]>
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