At all hours of the night, but particularly around 3AM, your entire house is permeated with the disembodied sounds of gurgling, wailing, crying, and screaming. These disturbingly annoying noises seem to come from everywhere, but are particularly loud here in the attic, usually accompanied by knocking in sets of threes.
The ghosts are doing band practice. It’s easiest to set firm boundaries when you first move in to allow the ghosts to only practice during the day when you’re at work, but if you’ve let them go like this for a while, it may be difficult to get them to change their ways. Old habits die hard. Instead, think of the wonderful free live music your house in now filled with. Consider investing in a guitar, keyboard, drums, or theremin and ask the ghosts to learn your favorite songs. Your living house guest will be blown away by the otherworldly quality of your new “sound system.”