Our expert says:
Of course, depression does occur in children, and in teens, so your doctor was wise to consider this, but also to explore other possibilities. Some teens just seem to go through a slothful and sleepy phase I haven't seen properly explained. And of course boredom may look alike, but needs to be managed very differently.
Explore whether there is SOME type of exercise that DOES interest him, as exercise works well for sloth, and depression. If he's often as joky as you say, maybe antidepressants aren't what's needed. Make sure your communication with him works well, that he feels free to tell you any time he IS feeling very low or has other problems. That nightly chats sound excellent.
Loss of motivation can't be treated by transfusion, as you have realized. Maybe try chartting to him about your worries about the consequences of not doing well at school, and how that could limit his options to pursue things he really will want in life.
Has he talked about his forming ideas about where he wants to go in life, and what he eventually wants to do ? Motivation arises best when its about getting to a specific destination, rather than as a vague generality.
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