... to be annoyed at loud neighbour (yet infrequent)?

[Mowly75]

Ah yes tonight is the night my ndn gets back with a mate or two from wherever she has been all week obviously breaking lockdown rules & laughs and yells and squeals all night. By my bedroom. Bad conversion (hers) / Victorian terrace situation . But! She is away a lot of the time - maybe around a third, maybe more. So AIBU to complain?! No drip feeding: I live with DD2 & a trumpet player, so I think IWBU. Although all our noise is daytime only, to be fair.

Unfortunately I think if you play the trimpet then you probably can't complain about the neighbour's noise.

Living next door to a trumpet player would drive me insane. And you’re saying it’s only one night a week she does this? I would let it go, buy some earplugs or something.

Depends if the noise is going on all night and affecting your sleep. And if it's a regular occurrence? I think if you complain you could expect one back if you have a trumpet player in your house.