Just an update. I think we have almost fully dropped the nap. F refuses to sleep at home for nap time (despite being always offered), and he is doing very well with 11.5 h nights. It's been 3 days of nn, and I think he won't nap today, after 11.45 h night (also because we change the clock tonight, so I prefer to put him to bed early). Problem will be when he's back at preschool on Wednesday, when they let him nap (and he usually takes it, resulting in a 9.5-10 h night)... But I decided not to force any nap in this Easter holidays, I will try to maintain quiet time and the possibility for him to nap, and I hope he gets used to it and eventually learns not to sleep at preschool if he doesn't need it.