Bed time

Bed time has been a nightmare... my son goes down for naps so well and puts himself to sleep as soon as he’s laid down... night time is so different. We spend at least a half an hour screaming and fighting going to bed which includes crying and screaming and I am lost on what to do. He naps in his crib, and sleeps in a pack and play next to our bed at night (I feel like it’s more for me than him and am not ready for him to move out of the room). Any suggestions? Could this be a leap? He’s already had two bottom teeth come in maybe he’s cutting a third?!