The relationship of sleep parameters and physical performances was assessed in young female handball players. Under 14 (13.44 ± 0.5 years), and under 17 (16.0 ± 0.8 years). Sleep patterns were evaluated using: Sleep quality (PSQI), insomnia (ISI) and sleepiness (ESS), questionnaires. Stork balance tests with open-eyes (OEB) and closed-eyes (CEB) were assessed. Squat-jump (SJ), standing broad jump (SBJ), five jump (FJT) and T-agility tests were determined. A positive correlation was found in U14 between the PSQI and ESS with agility time (r = 0.43 and 0.34, respectively), while a negative correlation was found between ISI and both: OEB (r = -0.48), and CEB (r = -0.38). For the U17, a negative correlation was found between ESS and CEB (r = -0.33). Results suggest that the quality of sleep related with age should be taken into consideration because it may affect balance and agility in young female handball players.