5 y.o. DS loves reading - taught himself how very early on and has been an avid reader ever since. He has a little reading light attached to his bunk bed. Recently, he's been staying up reading quite late - 9 or 10pm. I don't mind - he doesn't bother us (doesn't come downstairs) and he is careful not to wake his little sister (with whom he shares a room) up. And it is school hols at the mo so he can sleep late in the morning. But DH disagrees and thinks we should ban reading in bed altogether, because DS basically can't stop himself finishing the book - and then starting another. (We've tried telling him to read one or two chapters only but he really can't.) DH thinks it's not good because DS is too little to self-regulate and will get overtired. So - over to you, MN! What should we do?