Excessive daytime sleepiness (EDS) presents with daytime somnolence, fatigue, and difficulty staying alert, may lead to impaired academic performance, mental and physical health. EDS in pediatric age could be associated with genetic and metabolic disorders, as well as behavioral patterns and mental health. Diagnosis is made with sleep diaries or logs, actigraphy, or overnight polysomnography. Screening tools such as Epworth Sleepiness Scale are available and validated for pediatric age. Treatment of EDS is crucial to prevent adverse outcomes.