And when I mean "warming up," I mean they're getting one heck of an early start doing it. Early as in the a.m.
At 4:58 a.m., they banged on the shared wall.
Then at 5:40 a.m., I noticed two bumps on the shared wall.
The last bang, a loud one, happened at 11:04 a.m. And it definitely originated from their apartment.