Does anyone know why my baby suddenly doesn't want to sleep in his bed?

He's usually a great wee sleeper, loves his next to me. But the last couple of nights have been a struggle to get him to settle for the night. He is up constantly, crying until I pick him up then as soon as he is in my arms he is out like a light. He is currently going through leap 4, do you reckon its something to do with this? He has reflux but its well-managed and he typically doesn't get much bother from it now. Any ideas or anyone going through something similar? At this rate I'm just going to have to stay up all night so he can sleep on me 🥲🥺