I've given myself permission to just do what's easiest and works best and banished that little voice that says: Oh you shouldn't be doing that.
Yep...I am afraid the second one just had to fit in with whatever I wanted to do I was out and about alot more and they learn to sleep on the go.
I BF my second, didn't my first, so that was a little trial for starters. We got into a good routine and DS1 was and still is a dream child, that helped heaps when DS2 came along

You will adjust naturally to less sleep, I go to bed early no matter what. Did it before kids and still do it now, so that compensated.