My teen used to go into his bedroom after school and play Roblox for hours (and to use every week's allowance on Roblox). Since the beginning of this term he comes home and gets into bed. The lights are kept off even though it gets completely dark after 5. He says he is tired and wants to rest. Homework hasn't increased, no peer problems that I know off. No health issues. He looks and sounds normal when he gets home after school and if I venture into the bedroom. Asks to keep the light off as it's hurting his eyes. Back to normal around 7. It's been going on and off for over a week now. I heard this kind of behaviour could indicate a child is taking drugs. I spoke about drugs, he laughed it of. Am I being paranoid or do I have a reason to worry?