Hi everyone and thanks very much for the thoughts, sympathy and your own experiences. (They're on a previous page so I can't see all the names, but really did appreciate all the comments!)
Had a busy day with a friend dropping off baby stuff and then MIL round for a family/mother's day meal, so was completely shattered by 8 PM with the lack of sleep, and have had to take it very slow today too.
But some good news... I gave myself time to calm down, and went round just now to have a chat with the mum of the noisy buggers party teens, with DP's approval as long as I promised not to blow a fuse. I used the shit sandwich technique; I had some good news about some improvements to a shared park fence I've been battling the council over, so I started by telling her that good news. I should add that we don't know her well, but she's been friendly enough in the past and I knew it wouldn't be like taking on people like those described by one of the posters here (which sounded like a total nightmare)
Then I just said that we'd had a hard time with the parties - especially the first one, but the main issues were keeping us awake after midnight and the kids leaving the party waking us up as they went home. And (aided by my big bump) I told her I was pregnant.
She was mortified, and was really sorry especially as I was pregnant. She was really cross as she'd had words to say respect the neighbours, but obviously it hadn't sunk in. The really bad party was her lads' 16th - and she said it got out of control and she wasn't happy about it at all - however there was a second birthday (this past weekend) which she let go ahead, but was stricter about it. I said we had felt the second party was better but it was still pretty noisy when they went outside for cigs, and when they left at 3 am. (I can only imagine what it's like trying to get drunk 16 year olds to be thoughtful!)
She then said she's in two minds about saying no more parties anyhow as she knows they can be a boisterous bunch, and if they're not going to respect the neighbours then she's not cool about it. She's also going to think about how to manage outside smoking
She also said I should just come round if any future parties were bothering us, that it was ok to just pop round there and then. So I know we can just pop round to say "shut up please" nicely. But she promised there shouldn't be any parties coming up anyhow.
Phew!!
Hope everyone is having a good day. x