when you're high on Ambien, if you start walking backwards you won't be able to stop until you bump into something. I don't know how it works either, but it does. Also: He won't remember ANY of this.
I took Ambien once. I took it in a subway station and when I awoke I was surrounded by bodies. Apparently I had murdered a hundred and fifty two people with the plastic mechanical pencil I had in my pocket. I had to escape through the tunnels, they dubbed me the Subway Stabster.