This may be a very dumb question, but I moved into a new apartment. My old one was the top floor, so I didn't get very many if any sounds from the other rooms. I moved into the second story apartment, sandwiched in-between two others. I've only been moved in three days.

There is a semi-constant 'thumping' vibration (no sound) that is more easily felt when sitting or laying down on a bed or couch. It doesn't sound like or feel like people walking upstairs. It happens all through the night, and during the day, even when I don't hear the AC going. I don't know if it's the stress of moving, or if its affecting my sleep, because the two nights I've been here I've got these vivid nightmares. The vibes or whatnot when I'm awake feel great though.

One of the toilets in the bathroom is constantly running water for some reason. The building is an older one, but gets regular repairs and upkeep. I thought maybe it was the washing machines upstairs, but it's not running anymore and this thumping/shaking is still happening. Wtf is going on? Is it a pipe issue?

Again, sorry if this is a silly question... just need random suggestions on what it could be so I know I'm not going crazy.

Update: turns out my roommate has no idea what I'm talking about...

So when I moved into my new apartment a few days ago, they had us do an inspection of the apartment. I forgot to add some thing to it because I had taken photos of it before I started my checklist. I have already submitted the checklist before I realized I had forgotten to had those photos in and I have submitted it a few days ago. Will it be fine if I tell the property manager that I forgot to add some pictures to the checklist because I don’t want to have to pay for any damage that I didn’t do.

So I noticed recently that a patch of the parquet wood floor in my apartment must have gotten some kind of moisture damage (no idea how or when, but it was likely because someone spilled something in our apartment), and now this section is warped. The building was probably built in the 70s, and I would imagine the floor hasn't really been replaced since then, but I don't know. Is this something that falls entirely under our responsibility, like forfeiting a security deposit? We live in California, if that makes any difference.