Drunk trailer trash construction workers and their drunk wives being loud and listening to crappy music. Technically, I'm a traveling construction worker too LOL yet I'm a sober cat lady and I have thin walls so I'm sensitive to the partying at the RV park after 10pm. After 11, I go over and politely reason with them. After midnight, I call the sheriff. Yes, I'm THAT lady. We all go to work at 6am on Saturdays! Don't people sleep? Friday night is not "Friday Night" for us! Earplugs make me miss my alarm clock.
An annoying high pitched whistling noise coming from outside , from the apartment building next door. It might be one of the mechanical things on the roof or maybe some work is being done inside a unit. The noise comes and goes.