Drill a hole in the floor and flood the lower appartment with acid?
I know two things with certanty in this life. 1. I will never live in an appartment ever again after having lived next to crazy T.V. noise at 2am lady for 2 years, with crazy deaf 2am T.V. guy for a year before that, and 2. No one has the right to disturb your sleep with that level of noise at that hour.
Call the cops, Confront them directly, Buy a Taser and stun them into silence then feed them to the sharks have your dog eat their feamurs, whatever it takes. But it isn't worth your health or sanity to have to deal with that ****. They won't change unless forcible incentivized to do so, they don't care about your rights or well being as an individual, and you have no need to be civilized to them in this instance because they have already forfieted their claim to civility.