My daughter had grommets to fix chronic ear infections. So she could go swimming, we bought something called an Ear Band-It - a neoprene headband which comes with re-usable mouldable putty. You put the putty in your ears for a watertight seal, then wrap the neoprene band around your head to hold it in place.

Anyway, about half the reviews on the Amazon page were from swimmers with perforated eardrums, but the other half were from people saying they’re the best solution for being able to sleep in really noisy environments, particularly rock festivals. Not their designed purpose, but could be worth a try.

In the longer term though, call the authorities and/or move house.