15 month old dropping naps?

My son will be 15 months at the end of this month and he seems to be choosing to drop his nap altogether already. He will sleep from 7:00pm to 8/8:30am no problem but if he has a nap even just a short one he will be awake for a minimum of 4 hours in the middle of the night sometimes up to 6 hours like he isn’t tired 🤷🏼‍♀️ My daughter was having a nap up until almost 3 so this is throwing me off. Has anyone else’s little one dropped their nap completely this early?