OK, do you have a “smart phone” with a voice recording facility. If not, go HERE and look at your options to by a simple digital recorder.
Set the recorder up with the correct time and date and then send your neighbour a note that says something like “I am obliged to inform you that we are now recording noise disturbance from your apartment with a view to providing evidence in pursuit of a Noise Abatement Order from the District Court. The recordings will be date and time-stamped.”
Now, I don’t know if you actually are obliged to do that but it may have the desired effect of gatting them to pull their heads in.
But a threat isn’t a threat if you aren’t prepared to follow through with it, so be prepared to start recording when the noise starts. It would help if you were to say quietly what time of the morning it is and then let the recording run till the noise stops.
If this doesn’t work, then go to your District Court and apply for a Noise Abatement Order. You’ll find more information about that here.
Just one word of caution: this could exacerbate the problem – it may get worse before it gets better – but if you do get the order and they continue to make the noise, they are in breach of a court order and that is a criminal rather than a civil matter.