So my baby is nearly a month, and I'm not sure if I'm being lazy but I only ever get up to change his nappy once in the night around 2ish and its normally very full of wee, only occasionally a poo and then leave it until the morning, where again it's very full. Occasionally I do also leave it all night because it's just so much easier to feed and stay in bed (we have a next 2 me crib so I can stay in bed for night feeds) 
How often does everyone else change baby nappies in the night?