That would make sense! I agree though. I moved in with DP when his DD was 5 and we pretty much just got on with it whether she was here or not. She got up in the night a lot, but it didn't bother us (apart from the one time she walked in and DP pretty much threw me on the floor in alarm ).
That's what I thought. I asked him about it yesterday, and he did realise it wasn't feasible long term, his reasoning being that if we had out own kids they'd obviously be there all the time. But I was thinking of it not being an issue a lot sooner than our hypothetical children haha