Nighttime sleep apnea in school-age children can be a frightening, painful, and disruptive health condition that can appear out of nowhere. In some cases, it can even be life-threatening. Obstructive sleep apnea in children is a sleep disorder in which your child’s breathing is repeatedly blocked, either partially or completely, during sleep. The most common underlying cause of obstructive sleep apnea in children is tonsillitis. Early diagnosis and treatment are important to prevent complications that can affect a child’s growth, cognitive development, and behavior. In this article, we will provide useful information for parents about sleep apnea in school-age children.