We're just in the middle of a developmental issue with ONS too. As our LO's are the same age, I thought I'd mention it. With these DL I've found that DD wont go to sleep until much later at night no matter what I do, then wakes earlier or at the same time int he morning. She's slowly coming out of it now as ONS is lengthening slightly, that's how I know. Just ride it out as there's no much else you can do with no nap. Hth xx