Hi. Good that you are identifying your problems and seeking solution over this platform. I understand that you are facing major trouble while studying. At your age this is the commonest reason for stress. Usually after some struggle people are able to cope up with their stresses. However, during teen age, the body tends to form faulty coping up mechanisms like addictions (smoking, alcohol, porn). These habits start taking up most of the constructuve time. Your body is trying to avoid getting into the stress of studies by way of addiction n increased sleep. Both can be effectively managed with good counselling.