The tilted Bed and the long Fall

"I was lying in bed, but the bed was on a balcony or maybe a loading dock, somewhere high up with a thin railing I kept meaning to fix. I was half listening to my sister talk about her new job, and I felt weirdly responsible for remembering every word of it, like there'd be a quiz later. Then the mattress tilted. Not fast, just a slow lean, and I remember thinking "oh, that's not good" very calmly, the way you notice a spill. I grabbed for the blanket but it came with me. Then a jump, and I was falling past windows, and in each one there was somebody doing something ordinary, brushing teeth, folding laundry. A guy in one waved at me. I think I waved back out of politeness. The air smelled like wet cardboard. The drop went on way longer than it should have. I was trying to remember if I'd turned off the stove. Then I hit the floor of my actual bedroom with my whole body jerking, one arm half off the mattress, heart slamming. I lay there a minute, embarrassed, glad nobody saw."