The tilted Floor and the humming Walls

"I was in my apartment but the floor was tilted. Not a lot. Just enough that I kept noticing it. My coffee cup slid a little and I caught it without thinking. Then the whole place started to hum. That's the only word. Like a fridge but everywhere, in the walls, in my teeth. The cupboard doors all swung open at once and stayed open, swinging, but nothing fell out. I stood in the doorway because that's what you're supposed to do. Except the doorway was in the wrong spot, on the wrong wall. I stood under it anyway. My neighbor was in the hall saying "it's just the train" and I said "there's no train" and he shrugged and went back inside. His door closed so slowly. Then it stopped. Everything level again. I went to the kitchen and all the cupboard doors were shut. My coffee was still warm, which felt wrong. I woke up and lay still for a second, waiting to see if my room was tilted. It wasn't. But I checked the cupboards anyway. All shut. Fine. Fine."