At 6:40 a.m., I noticed that the Upstairs Stomper had turned on the TV.
At first, I thought it was the quiet neighbors next door. But after going into the kitchen and bathroom, I was still able to hear the beep-boop-play-a-bongo type noises. So it has to be from upstairs, because the sounds were overhead.
It's 7:18 a.m. as I write this.