I have two perfectly normal teenagers: good at school/sport/have lots of friends but when they sit in front of their XBox or computer they are away....they can sit for hours if I don't monitor their screen time. This morning my 13 year old got up at 5.30 am to play a new beta version of Destiny, waking me in the process. He would sit there till lunchtime if I let him. I won't, but it is a drag to be in this constant "get off there now" routine. Any insight? How many hours a day is normal/ok? Anyone read any studies on what this type of involvement in violent games does to an evolving brain?(they are all violent no matter how gorgeous the graphics) Many positives I know but when it interferes with daily life....