I'm writing this very sleep-deprived and grumpy.
We moved about two weeks ago and had a couple of external noises but after getting earplugs to sleep, it didn't bother me. Our neighbours moved in last week and the noise is constant and earplugs don't block the sound. My only guess is they have a toddler or an older child who doesn't sleep and runs around the apartment for about 12 hours a day. I am probably wrong as it doesn't seem realistic but that is what it sounds like. From 1 pm in the day and even at 2 am this morning it was constant. I'm not sure if it stopped or I just passed out. I even went out to the communal hallway and it could be heard there so I thought maybe kids were running up and down the communal hallway...
I can't be certain but my partner has said no way to go up to speak with a neighbour as he has friends who have "discussed "with their neighbours about noise and have ended up in violent feuds. I am not a violent person at all and would speak to them like another person as maybe they don't realise.
Moving isn't an option right now and our council suggest calling the police which seems extreme. Has anyone ever successfully soundproofed their home in a similar situation? My daughter is waking up 5/6 times in the night and I think it's the noise as she usually sleeps through maybe waking once.
To add, I expect noise in a block and having a toddler myself who sometimes throws things and runs around but I am conscious of neighbours below and try to control it.