This study aimed to examine the effects of 12 weeks of strength training (ST) on sleep quality and daytime sleepiness in adolescents with sleep complaints. Thirty adolescents were randomly assigned to 2 groups: ST group (ST, n = 18) and control group (CG, n = 12). Anthropometric, body composition, one-repetition maximum test, and sleep parameters, Pittsburgh Sleep Quality Index (PSQI) and Epworth Sleepiness Scale (ESS) were evaluated. Training consisted of 55 min per day (3 times a week, for 12 weeks), 3 sets of 10 to 12 repetitions with a 1-minute rest interval between sets and exercises. Baseline and postintervention differences were analyzed using Generalized Estimating Equations and the effect size (ES) with Cohen's d coefficient. Significance was set at (p < 0.05). After 12 weeks of ST, a significant decrease in the PSQI score (7.3 +/- 0.7 versus 5.1 +/- 0.6; ES = 4.10) was observed in the ST group, but not in the CG (6.3 +/- 0.8 versus 7.4 +/- 0.7; ES = 1.53). A significant decrease in ESS score was found in the ST group (10.1 +/- 0.7 versus 8.2 +/- 0.7; ES = 3.08), without differences in the CG (10.7 +/- 0.8 versus 11.0 +/- 0.7; ES = 0.56). The ST group presented increased total sleep duration (hours per min) (6.2 +/- 0.2 versus 6.9 +/- 0.2; ES = 3.60), but not the CG (7.0 +/- 0.2 versus 6.8 +/- 0.1; ES = 1.32). Individual analyses showed = 67% of adolescents experienced a reduction in PSQI (8.3; 95% CI 6.8 to 10.1) and ESS (8.3; 95% CI 6.7 to 9.9) scores after ST, whereas only = 17% of control subjects presented reduced scores (PSQI 11.1; 95% CI 9.5 to 12.9 and ESS 11.0; 95% CI 9.4 to 12.6). Strength training improved sleep quality and increased total sleep duration.

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