I have started taking ds to a kind of playgroup where he is meant to stay on hiws own. He normally wakes up between 7:30 and 8:30 (lately more towards the 7:30 end) and the playgroup takes place between 10am and 1pm.
When he is at home he normally has his first (and only) nap between 3 and 4 hours after waking so he does get tired during the playgroup and I think this is key to the fact that he will not let me go home...
Do your toddlers also have their first nap this early or could this have something to do with the fact he still wakes for night feeds (though not fully awake)?