It scared more than the daylights out of both of us - I saw her lying at the bottom of the stairs and totally freaked out. 20 minutes later she was sound asleep - I NEVER went back to sleep that night.
I like the idea of the screen door. We had actually thought about a dutch door - top open, bottom locked and then realized she would be able to get over that one as well.
No I don't think I would be able to sleep after that either .. too scary