So, I was sitting in the loung chair, and realised that as Cloud was at the window face pressed up against it, she she seemed to have a noisy exhale.
I've known her to go wild for birds while seated there, so did a quick search on noisy breathing and excitement, and after a quick look round went up to look a bit more closely...
When I got there I came to realise that the noise was not actually my little girls breathing, but one of the next door neighbours sweeping up some sand/dust/similar out on the path at the front of their house!!!