My 4 mo LO always wakes up between 20-45 minutes into his naps as he always jolts. I have been trying to extend his naps with wake to sleep with little success. I am also using PU/PD and Shush Pat, which usually gets him back to sleep, however he continues jolting throughout his entire nap and I usually have to stand over him putting my hands on him when he jolts just to keep him asleep. It's as though he can't quite get into a deeper sleep and the jolts keep rousing him. Please help! I am trying to stay on a 4 hour EASY, but the short naps are making it difficult and he is really cranky cause he's tired.