If your child is having trouble sleeping, school assignments that require computer use in the evening could be the cause. Blue light emissions reduce melatonin, which is needed for sleep. Additional issues arise when a child isn't rested, including behavioral problems, irritability and the inability to concentrate. A child glued to a computer also isn't exercising, which contributes to childhood obesity, another major concern of the U.S. Surgeon General and the American Academy of Pediatrics. Children's eyes may also absorb more blue light than adults from digital device screens, according to a recent study, putting them at greater risk for premature retinal damage risk.