Bit of a late reply, since you posted about 10 days ago - but here goes anyway!
My favourite stuffing for night nappies (Minki pockets) is bamboo prefolds (I have several from Nappy Nation) and just pad fold them & stuff them in. My 14mo little boy is a *very* heavy wetter at nights and they take it all!
For my 2.5yo daughter at nights, I actually just use an ordinary Junior Joy Prefold (again, pad folded) and with a microfibre insert on top of it. It's possible the same would work for my little boy, but I started using bamboo on him first before I was using pockets for my daughter. For day time, I have a few pockets but mainly use fitteds (Little Lamb, Tots Bots, various bamboo shaped nappies, ME on size, etc), but I recently found Wonderoos and love them. It seems microfibre inserts don't hold much from my little, so I usually just use padfolded Junior Joy prefolds (have about 40+ of them, so very convenient!). Minki fleece pockets are my all time favourite nappy!
Such cute fabrics and soft & comfy. However, I'm yet to see how they'll work for summer pjs, as my little boy is a tummy sleeper and it seems the urine comes through if he's not in fleece pjs!