K.U.
Is he maybe overtired? When they get overtired, it can actually be harder for them to go to sleep and they can get more wound up. How exactly did the bedtime end getting pushed later and later? Do you have a routine in place that helps him start to wind down in preparation for bedtime? My daughter is 3 and we have always had changing into PJs, brushing teeth, stories and cuddles before bed. And it happens at the same time every night. She is so used to it by now that she really does not protest when it is bed time. She will find all kinds of ways to drag it out ("One more story Mama please!") but we just stand firm and stick with the routine. She knows what is coming and what to expect.