Cluster feeding concerns

Our last night in the hospital and our first night home have been completely different than the other 5nights at the hospital in terms of feedings and I'm not sure what we should do.

I had a lot of blood loss during my c section so my breasts have been slow to produce, but have recently been picking up. In the meantime we rely on formula and supplement with the breast milk when I have a good collection.

Suddenly though around 10p usually til about 3a-4am our baby boy will just not settle without continuous feedings. During the day we stick to no more than 3hrs apart with ease. But come evening now he wants to be fed like every 1-1.5hrs. As a result after his last feeding, he will finally settle and then sleep for almost the whole night. It means he goes more than 4hrs without formula or breast milk. Am I being a terrible mother. The constant up during the cluster feeding has my partner and I exhausted and neither of us wants to wake him up after he settles just in case it sets off more cluster feeding!