Mobile phones can result in sleep deprivation and poor grades: When parents check their mobile phones usage, they often find that their children are taking calls, text message or play games at all hours of the day and night.This behavior can leave your child sleep deprived, which can impact their grades in a negative way. A study done by the National Sleep Foundation found that 1 in 5 teens age 13 to 18 are awakened by a call or text message a few times a week