I feel your pain. MyDM once woke my twins when they were 6 weeks and I'd finally got them over to sleep for the evening with the stupid flash on her stupid camera that she doesn't even know how to use properly. Argghhhh.
Yeah we have white noise because there's a few lads with motor bikes that regularly bomb up and down waking her. I just can't believe it after 6 months of 6 hour walks a day I thought I was finally winning? No.
My non sleeper is starting to sort of fall into a routine. Ish. It's been hell on toast but its starting to look less bleak. However in the last 3 days we have had naps/ night time interrupted by back firing bikes, hammering neighbours at 9 bloody 15 at night and now an exploding gas torch outside.
Fantasising about some kind of death ray that I can fire at such people, one handed, while soothing a screaming, previously sleeping baby.