Exactly the same here, other than living in a hotel but we did have a house move when DS2 was 12 weeks & DS1 was almost 2.
DS2 slept as expected until about 4 months then I'd nurse in the night so that DS1 didn't wake! This went on for a while & he would not resettle without a feed, even when offered water instead. In the end, DH would go in & he resettled & within a few days was STTN for the 1st time & has done ever since! He was about 10.5 mths but at least we got there. Also remember, at 6 mth it's common for NW - with DS1 they stopped at around 7.5 mth.