They are waking up so tired. That is why I think they need the sleep.
About the nap, my DS 7 would still take a nap if he could! Just like his mama!
I don't think I can do very much about the nap, this is the time the daycare cleans up from the morning, gets snacks out, and generally has a break. I don't begrudge them the break, I know they need it. But I will try pushing their bedtime later and see what happens. I still wish I had some way of keeping them in bed. Even when it's just them 2 and their dolls (snuggies) they will get up to play with them and turn on the light!
I am sure they are tired because they are too wide awake from a 2 hour afternoon nap to fall asleep at a good time at night so they are not getting the continuous sleep they need which is why you need to cut out or at least DOWN their nap so they can go to sleep around 8 or so in the evening. I don't buy the "needs a break" argument at the daycare. If this is the case, the kids that don't NEED a nap should be in a separate room doing a quite activity like watching a movie, coloring, reading books, etc. or even not a quite activity but something away from the sleeping kids. Parents do this day in and day out with kids that don't nap, there is no reason day care providers can't too. They should have enough people in the toddler room to cover breaks, etc. and handle it that way.

