Hi @Murgatroyd. I'm definitely a nightowl as well.
i think the main thing is knowing how much sleep he is getting, rather than the hours in which he gets that sleep. If he's getting somewhere between 7 & 10 hours a night, I would think that's fairly normal for a teenager. If he's sleeping more than that, it's worth starting to look at possible other symptoms of depression - lack of motivation, feelings of helplessness, appetite or weight change, loss of interest in things.
I suspect though that he is just staying up really late becuase he can! But do try to rule out depression.
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