I used to build roads and rebuild them. recyclers and pavers etc Yes jack hammers . 99% of the time we never worked at night unless it was on a main very busy street. The only reason I could see them working at night is if its a huge job and they're pulling 24 hour shifts. YES there are usually codes against working at nite in a Res. neighbor hood. They are supposed to be permitted.and warning tags sent out thru the neighbor hood before starting the project..... Hope it helps