My son is 12 years 6 months old. He weighs 56 kgs and he is 4.11. He sometimes shows very much interest in studies but at times runs away from it. He is very much addictive to TELEVISION and when we ask him to stop watching he becomes very violent, like he bangs the door or throws out whatever he feels like. This aggresiveness repeats whenever we ask him to study. He is 80% and above in academics. He is my only child. Sometimes he sucks his right thumb especially when alone or sleepy. Know not is this related to adolescence issue, habit , loneliness or fear? Pls advise.