My son is now 8 and just recently formerly diagnosed. He never slept as an infant. Our first night in the hospital he stayed awake all night. Hindsight 20/20 I now can see that this was all correlated. I don’t know what I would do differently, but similar to PP, he dropped naps before age 2, and even when he did nap it took us as long to get him to sleep as he would sleep (rock for an hour, sleep 40 min). I got to the point that I let him cry it out, because nothing I seemed to do helped.