wrote:

... My neighbour below me always invites friends over, plays loud music, etc.
I hear him till the wee hours DAILY!!! It's seriously driving me insane!
... the floors are made of wood.

It is fortunate that you are insane, and above him. You might install powerful
speakers in the floor, aimed down, with a microphone and an annoying delay, or
drill holes and let your sink overflow. Boiling oil and molten lead are more
traditional. Do you know any clog-dancing troupes looking for practice space?

Nick