 Excess screen time can be bad for kids' mental health and can also be a physical concern. WTOP's Matt Koufax spoke with local doctors about limiting your child's screen time, especially during the summer. We have a whole generation of kids that are used to screens. Kaiser Permanente child and adolescent psychologist Dr. Asha Patton-Smith says excess screen time can actually deplete endorphins, causing aggression and irritability.