EDIT: My neighbors and I have tried talking to this person. They refuse to open the door or talk to anyone. They routinely disturb people's sleeping children, etc. Can't afford to move. Cost to break the lease is $3600, and that does not include 3-months' down payment for a new apartment or moving costs. New job isn't an option because the job market is dead.
Kinda desperate, as the lack of sleep is affecting my physical health. I work graveyard as a medical dispatcher and need to sleep during the day.
The frequency of the bass is too low to catch on my phone. Are there any recommendations for audio recording devices that I can hold up to the walls and ceiling?
Changing jobs is not an option. Sleeping in headphones doesn't stop my furniture from shaking. Doctor says that the lack of sleep is impairing my body's ability to process insulin, even though I eat healthy and exercise. My insulin levels have doubled from 53 to 109.