Teenagers in the next road- it runs at right angles to us, so I can see the back of their house if I look out of the loft- had loads of friends round last night.
Fair enough- there was no music, but my god they were loud in the garden. We're about 8 houses away, and at 11pm I shut all the windows in our bedroom. At 2 pm they were still all shrieking, swearing...finally went in about 3.
I was awake then till 5, and feel knackered.
Parents are obviously away- would it be unreasonable to knock on the door and ask them (politely) to consider neighbours' feelings?