Dragons sleeping ... Yeah sure, but then I'd like a chance of other creatures sleeping as well. Dragons shouldn't be the only ones who can be caught napping. Maybe monsters could be listed with an activity period (diurnal, nocturnal, crepuscular), or in the case of sunless environment dwellers, a percentage chance of being awake.
Meanwhile, in response to the OP, I'd like the Kris Kringles at Wizards of the Coast to put a knight subclass for fighters, a necromancer, a star pact warlock, tactics and narrative modules, trap building, a comprehensive downtime system, extreme weather rules, and most importantly, metallic dragons into the 5e stocking. A module for running Victorian settings with rules for pistol duelling would be nice, but is not essential.
Asking purely out of interest, what would a Knight fighter subclass get you that wouldn't come with an appropriate Trait in a background? I think there's a social and a training side to a knight, but while the classic knight-in-shining-armour has both, the concepts aren't exclusive.
You could have a knight background with a knighthood trait, giving you some rights (and expectations). Since all the background traits are supposed to be achievable in play, that means you have built-in mechanics to reward people in play with a knighthood. That way you can start out in play with the social status of a Knight, or achieve it during play regardless of your class.
For the training side, the traditional set of skills might best work as a Cavalry fighting style, available to any martial fighting class. Something that would complement but not replace the Mounted Combatant feat that anyone can take - maybe disadvantage on attacks of opportunity against you or your mount if you move, attack, and then move again.
Or am I missing something that's essential for a "knight", to you?
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