2.5 week old fighting sleep...

Lo

My little man is an amazing sleeper when he sleeps but he fights sleep really hard sometimes. A lot of the time he will eat and stay wide awake until the next feeding time. He doesn't generally cry in that time. He has also literally been on this schedule of doing awful with sleeping one night and great the next. It's been like that basically since we came home. He will only fall asleep if he is rocked to sleep and if he is put down, he usually wakes up a couple minutes later. We have tried to just let him lay without movement or anything but he doesn't fall asleep when we do. He will just lay wide awake. Anyone else deal with anything like this? Did you find anything that worked for you? We bought a rock n play sleeper and it seems to have helped a little.