Thanks, I think I won't drop the nap, since he really seems to need it. As for DS2 he goes to bed around 12.30 pm till around 2.30 pm, what I've been doing for the last two days is just to bring them bck to bed and say, it's not time to get up yet, it's still bedroom time and for DS1 that seems to work, he'll snooze for another hour, DS2 is a little harder, but so far he's been playing quitely in his bed for another hour...
we'll see where this leads us, thanks for helping!