Baby didn't really sleep during second nap today- how to proceed

Hi all. My 1 year old son (3/3.25/4) went down as usual for his second nap. No fuss or anything but he was sitting up for most of it and not sleeping. He was content just doing that but he did not actually fall asleep. Would you put down for early bedtime or count the hour in the dark as a rest period still? This hasn't happened before so I'm not sure what to do. Thank you!